Index checker members without redundant symbol maps by jakebailey · Pull Request #64781 · microsoft/TypeScript

Jake Bailey (jakebailey) · 2026-10-13T17:36:41Z

Instantiated and inherited object types keep a name-to-symbol map beside their ordered property list, duplicating pointers across millions of types.

Uses the ordered property list as the source of truth. Small types need no index; larger types use pointer-free integer slots.
Keeps map semantics for mutable module exports, reserved members, mismatched names, and recursive resolution.
VS Code measurements showed 7.61% less retained heap and 9.89% less GC scanning.

Copilot

🟡 Changes recommended

Two fast paths can drop alternate map keys when one symbol appears under both canonical and mismatched names.

2 open findings

What changed in this PR

Optimizes checker member lookup by replacing redundant symbol maps with compact integer indexes while retaining fallback map semantics.

Changes:

Adds compact property indexing and lookup helpers.
Updates checker consumers to use the new representation.
Adds lookup, fallback, and GC tests.

File	Description
`tsc/internal/checker/types.go`	Implements member indexes and lookup helpers.
`tsc/internal/checker/types_test.go`	Tests member lookup behavior.
`tsc/internal/checker/services.go`	Iterates indexed or fallback members.
`tsc/internal/checker/nodebuilderimpl.go`	Materializes member tables when copying types.
`tsc/internal/checker/checker.go`	Integrates indexes into resolution and instantiation.

🧠 Review effort: Balanced

💡 Add a code-review agent skill for context-aware, tailored reviews. Learn more in the docs.

Copilot

🔵 Needs a closer look

The change affects foundational checker member resolution and warrants final human validation despite comprehensive tests.

0 open findings

2 resolved since last review

🧠 Review effort: Balanced

Jake Bailey (jakebailey) · 2026-10-14T17:13:33Z

TypeScript Bot (@typescript-bot) perf test this faster

typescript-automation · 2026-10-14T17:13:41Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`perf test this faster`	✅ Started	👀 Results

typescript-automation · 2026-10-14T17:41:16Z

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-Unions - native}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_115,276	_115,276	_~	_~	_~	_{p=1.000 n=12}
_Types	_79,613	_79,613	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{113,573k (± 0.07%)}	_{109,550k (± 0.05%)}	_{🟩-4,023k (- 3.54%)}	_109,425k	_109,709k	_{p=0.000 n=12}
_{Memory Allocs}	_{2,212,508 (± 0.01%)}	_{2,211,642 (± 0.01%)}	_{-866 (- 0.04%)}	_2,211,374	_2,211,973	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.039s (± 3.69%)}	_{0.042s (± 7.06%)}	_~	_0.037s	_0.054s	_{p=0.233 n=12}
_{Bind Time}	_{0.014s (± 9.56%)}	_{0.014s (± 9.42%)}	_~	_0.011s	_0.017s	_{p=0.540 n=12}
_{Check Time}	_{0.482s (± 0.98%)}	_{0.473s (± 0.95%)}	_{-0.009s (- 1.94%)}	_0.464s	_0.488s	_{p=0.005 n=12}
_{Emit Time}	_{0.270s (± 2.12%)}	_{0.268s (± 1.35%)}	_~	_0.257s	_0.276s	_{p=0.787 n=12}
_{Total Time}	_{0.813s (± 0.76%)}	_{0.804s (± 0.78%)}	_{-0.009s (- 1.10%)}	_0.790s	_0.824s	_{p=0.016 n=12}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_{846,920 (± 0.07%)}	_{847,178 (± 0.06%)}	_~	_846,059	_848,382	_{p=0.514 n=12}
_Types	_{247,032 (± 0.00%)}	_{247,031 (± 0.00%)}	_~	_247,028	_247,035	_{p=0.786 n=12}
_{Memory Used}	_{596,331k (± 0.02%)}	_{565,199k (± 0.03%)}	_{🟩-31,132k (- 5.22%)}	_564,805k	_565,659k	_{p=0.000 n=12}
_{Memory Allocs}	_{13,141,951 (± 0.05%)}	_{13,132,052 (± 0.07%)}	_{-9,899 (- 0.08%)}	_13,122,085	_13,173,162	_{p=0.003 n=12}
_{Config Time}	_{0.017s (± 1.95%)}	_{0.017s (± 1.99%)}	_~	_0.016s	_0.017s	_{p=1.000 n=12}
_{Parse Time}	_{0.224s (± 2.58%)}	_{0.223s (± 2.98%)}	_~	_0.211s	_0.251s	_{p=0.723 n=12}
_{Bind Time}	_{0.084s (±13.23%)}	_{0.087s (±13.16%)}	_~	_0.060s	_0.105s	_{p=0.434 n=12}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=12}
_{Emit Time}	_{1.568s (± 1.21%)}	_{1.559s (± 1.32%)}	_~	_1.521s	_1.628s	_{p=0.340 n=12}
_{Total Time}	_{1.916s (± 0.91%)}	_{1.904s (± 0.98%)}	_~	_1.869s	_1.957s	_{p=0.369 n=12}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_4,331,835	_4,331,835	_~	_~	_~	_{p=1.000 n=12}
_Types	_1,370,520	_1,370,520	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{2,625,292k (± 0.06%)}	_{2,172,460k (± 0.05%)}	_{🟩-452,832k (-17.25%)}	_2,169,522k	_2,174,668k	_{p=0.000 n=12}
_{Memory Allocs}	_{27,705,207 (± 0.05%)}	_{27,773,789 (± 0.08%)}	_{+68,582 (+ 0.25%)}	_27,724,278	_27,824,137	_{p=0.000 n=12}
_{Config Time}	_{0.017s (± 1.70%)}	_{0.017s (± 1.70%)}	_~	_0.016s	_0.017s	_{p=1.000 n=12}
_{Parse Time}	_{0.478s (± 2.25%)}	_{0.474s (± 2.84%)}	_~	_0.436s	_0.501s	_{p=0.744 n=12}
_{Bind Time}	_{0.002s (±24.21%)}	_0.002s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{7.361s (± 0.62%)}	_{7.323s (± 0.61%)}	_~	_7.161s	_7.432s	_{p=0.266 n=12}
_{Emit Time}	_{0.503s (±12.53%)}	_{0.440s (± 8.48%)}	_{🟩-0.064s (-12.61%)}	_0.420s	_0.628s	_{p=0.003 n=12}
_{Total Time}	_{9.105s (± 0.56%)}	_{9.006s (± 0.39%)}	_{-0.100s (- 1.09%)}	_8.916s	_9.087s	_{p=0.001 n=12}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,388,669	_1,388,669	_~	_~	_~	_{p=1.000 n=12}
_Types	_441,862	_441,862	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{1,319,822k (± 0.62%)}	_{1,284,678k (± 0.80%)}	_{-35,144k (- 2.66%)}	_1,262,950k	_1,310,715k	_{p=0.000 n=12}
_{Memory Allocs}	_{78,278,716 (± 0.07%)}	_{78,117,244 (± 0.10%)}	_{-161,471 (- 0.21%)}	_77,731,165	_78,233,726	_{p=0.000 n=12}
_{Config Time}	_{0.004s (±16.26%)}	_{0.004s (±15.23%)}	_~	_0.002s	_0.005s	_{p=0.482 n=12}
_{Parse Time}	_{0.251s (± 1.98%)}	_{0.252s (± 1.98%)}	_~	_0.242s	_0.266s	_{p=0.619 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{1.747s (± 0.38%)}	_{1.749s (± 0.32%)}	_~	_1.731s	_1.760s	_{p=0.486 n=12}
_{Emit Time}	_{0.307s (± 5.78%)}	_{0.305s (± 4.40%)}	_~	_0.273s	_0.340s	_{p=0.876 n=12}
_{Total Time}	_{20.525s (± 0.71%)}	_{20.417s (± 0.66%)}	_~	_20.025s	_20.708s	_{p=0.410 n=12}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_334,953	_334,953	_~	_~	_~	_{p=1.000 n=12}
_Types	_197,616	_197,616	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{247,523k (± 0.03%)}	_{239,085k (± 0.03%)}	_{🟩-8,438k (- 3.41%)}	_238,855k	_239,263k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,329,284 (± 0.01%)}	_{4,325,015 (± 0.02%)}	_{-4,268 (- 0.10%)}	_4,323,375	_4,329,838	_{p=0.000 n=12}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.114s (± 5.60%)}	_{0.117s (± 4.34%)}	_~	_0.104s	_0.132s	_{p=0.522 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{1.001s (± 0.63%)}	_{1.003s (± 0.57%)}	_~	_0.990s	_1.023s	_{p=0.580 n=12}
_{Emit Time}	_{0.145s (± 7.56%)}	_{0.147s (± 3.88%)}	_~	_0.136s	_0.170s	_{p=0.876 n=12}
_{Total Time}	_{1.317s (± 1.06%)}	_{1.320s (± 0.73%)}	_~	_1.300s	_1.349s	_{p=0.681 n=12}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_303,834	_303,834	_~	_~	_~	_{p=1.000 n=12}
_Types	_181,663	_181,663	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{215,269k (± 0.02%)}	_{205,869k (± 0.02%)}	_{🟩-9,400k (- 4.37%)}	_205,798k	_205,976k	_{p=0.000 n=12}
_{Memory Allocs}	_{1,401,630 (± 0.02%)}	_{1,407,756 (± 0.01%)}	_{+6,126 (+ 0.44%)}	_1,407,311	_1,408,220	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.098s (± 2.62%)}	_{0.098s (± 3.53%)}	_~	_0.090s	_0.106s	_{p=0.966 n=12}
_{Bind Time}	_{0.040s (± 6.95%)}	_{0.038s (± 5.53%)}	_~	_0.034s	_0.044s	_{p=0.122 n=12}
_{Check Time}	_{0.782s (± 0.45%)}	_{0.799s (± 0.91%)}	_{+0.016s (+ 2.09%)}	_0.779s	_0.817s	_{p=0.001 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{0.936s (± 0.48%)}	_{0.950s (± 0.68%)}	_{+0.014s (+ 1.46%)}	_0.933s	_0.967s	_{p=0.001 n=12}
_{vscode - native}
_Errors	₃₉₆	₃₉₆	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_11,687,315	_11,687,315	_~	_~	_~	_{p=1.000 n=12}
_Types	_3,851,234	_3,851,234	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{5,515,208k (± 0.02%)}	_{4,988,280k (± 0.02%)}	_{🟩-526,928k (- 9.55%)}	_4,986,346k	_4,990,566k	_{p=0.000 n=12}
_{Memory Allocs}	_{56,201,117 (± 0.02%)}	_{55,918,783 (± 0.01%)}	_{-282,334 (- 0.50%)}	_55,908,214	_55,933,213	_{p=0.000 n=12}
_{Config Time}	_{0.075s (± 0.41%)}	_{0.075s (± 0.43%)}	_~	_0.074s	_0.075s	_{p=1.000 n=12}
_{Parse Time}	_{1.732s (± 1.50%)}	_{1.766s (± 1.95%)}	_~	_1.676s	_1.853s	_{p=0.089 n=12}
_{Bind Time}	_{0.690s (±11.94%)}	_{0.591s (±11.37%)}	_~	_0.483s	_0.822s	_{p=0.060 n=12}
_{Check Time}	_{13.457s (± 1.15%)}	_{13.457s (± 0.80%)}	_~	_13.231s	_13.706s	_{p=0.724 n=12}
_{Emit Time}	_{5.022s (± 8.34%)}	_{5.411s (± 4.96%)}	_~	_4.560s	_5.913s	_{p=0.143 n=12}
_{Total Time}	_{21.067s (± 1.49%)}	_{21.391s (± 1.20%)}	_~	_20.706s	_22.092s	_{p=0.110 n=12}
_{webpack - native}
_Errors	₅₈₄	₅₈₄	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,299,351	_1,299,351	_~	_~	_~	_{p=1.000 n=12}
_Types	_598,360	_598,360	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{789,490k (± 0.01%)}	_{721,694k (± 0.02%)}	_{🟩-67,796k (- 8.59%)}	_721,265k	_722,043k	_{p=0.000 n=12}
_{Memory Allocs}	_{6,054,054 (± 0.04%)}	_{6,045,683 (± 0.02%)}	_{-8,371 (- 0.14%)}	_6,042,323	_6,049,949	_{p=0.000 n=12}
_{Config Time}	_0.009s	_0.009s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.300s (± 2.42%)}	_{0.292s (± 2.65%)}	_~	_0.269s	_0.315s	_{p=0.065 n=12}
_{Bind Time}	_{0.078s (±10.39%)}	_{0.078s (± 6.67%)}	_~	_0.068s	_0.092s	_{p=0.578 n=12}
_{Check Time}	_{1.965s (± 0.78%)}	_{1.997s (± 0.51%)}	_{+0.032s (+ 1.63%)}	_1.969s	_2.035s	_{p=0.000 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{2.390s (± 0.58%)}	_{2.415s (± 0.59%)}	_{+0.025s (+ 1.05%)}	_2.371s	_2.457s	_{p=0.013 n=12}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,062,854	_1,062,854	_~	_~	_~	_{p=1.000 n=12}
_Types	_390,845	_390,845	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{472,305k (± 0.03%)}	_{414,136k (± 0.03%)}	_{🟩-58,170k (-12.32%)}	_413,909k	_414,439k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,226,958 (± 0.14%)}	_{4,180,993 (± 0.09%)}	_{-45,964 (- 1.09%)}	_4,173,129	_4,193,948	_{p=0.000 n=12}
_{Config Time}	_{0.003s (± 6.23%)}	_0.003s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.139s (± 2.61%)}	_{0.140s (± 3.09%)}	_~	_0.130s	_0.151s	_{p=0.966 n=12}
_{Bind Time}	_{0.039s (±11.45%)}	_{0.046s (±18.37%)}	_~	_0.035s	_0.069s	_{p=0.080 n=12}
_{Check Time}	_{1.007s (± 1.18%)}	_{1.035s (± 0.98%)}	_{+0.028s (+ 2.80%)}	_1.011s	_1.058s	_{p=0.001 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{1.194s (± 1.13%)}	_{1.230s (± 0.75%)}	_{+0.036s (+ 3.00%)}	_1.197s	_1.245s	_{p=0.000 n=12}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
mui-docs - native
strada-build-src - native
strada-compiler - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₁₂
_Baseline	_baseline	₁₂

Developer Information:

Download Benchmarks

Lazy member resolution removed the member maps of instantiated classes and interfaces, but anonymous, mapped, and other resolved object types still keep a name-to-symbol map beside their ordered property list. When every member is a named property stored under its own name, that map duplicates the property list, and its symbol pointers and string headers add to the live heap and to what the collector must scan. Use the property list as the source of truth for those types. Small types are searched directly, and larger ones get an index of pointer-free slots. Module exports, reserved members, and tables with other keys keep their maps.

Jake Bailey (jakebailey) · 2026-10-25T00:19:29Z

TypeScript Bot (@typescript-bot) perf test

typescript-automation · 2026-10-25T00:19:34Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`perf test`	✅ Started	👀 Results

typescript-automation · 2026-10-25T00:54:43Z

Jake Bailey (@jakebailey)
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-Unions - native}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_88,466	_88,466	_~	_~	_~	_{p=1.000 n=12}
_Types	_79,607	_79,607	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{109,203k (± 0.06%)}	_{108,700k (± 0.08%)}	_{-503k (- 0.46%)}	_108,533k	_108,915k	_{p=0.000 n=12}
_{Memory Allocs}	_{2,196,557 (± 0.00%)}	_{2,197,244 (± 0.01%)}	_{+687 (+ 0.03%)}	_2,196,991	_2,197,692	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.049s (± 2.51%)}	_{0.048s (± 3.94%)}	_~	_0.043s	_0.052s	_{p=0.613 n=12}
_{Bind Time}	_{0.017s (± 9.35%)}	_{0.018s (±11.00%)}	_~	_0.013s	_0.021s	_{p=0.674 n=12}
_{Check Time}	_{0.575s (± 0.75%)}	_{0.583s (± 0.94%)}	_{+0.008s (+ 1.32%)}	_0.574s	_0.598s	_{p=0.040 n=12}
_{Emit Time}	_{0.322s (± 2.50%)}	_{0.323s (± 2.34%)}	_~	_0.302s	_0.338s	_{p=0.854 n=12}
_{Total Time}	_{0.973s (± 0.71%)}	_{0.981s (± 0.94%)}	_~	_0.963s	_1.016s	_{p=0.235 n=12}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_{586,591 (± 0.01%)}	_{586,585 (± 0.02%)}	_~	_586,093	_586,820	_{p=0.713 n=12}
_Types	_{241,692 (± 0.00%)}	_{241,693 (± 0.00%)}	_~	_241,690	_241,701	_{p=0.737 n=12}
_{Memory Used}	_{551,244k (± 0.02%)}	_{550,835k (± 0.02%)}	_{-409k (- 0.07%)}	_550,601k	_551,082k	_{p=0.000 n=12}
_{Memory Allocs}	_{13,074,103 (± 0.06%)}	_{13,080,860 (± 0.09%)}	_{+6,757 (+ 0.05%)}	_13,068,547	_13,128,881	_{p=0.007 n=12}
_{Config Time}	_{0.020s (± 1.21%)}	_{0.020s (± 1.21%)}	_~	_0.020s	_0.021s	_{p=1.000 n=12}
_{Parse Time}	_{0.277s (± 2.64%)}	_{0.283s (± 3.34%)}	_~	_0.264s	_0.324s	_{p=0.311 n=12}
_{Bind Time}	_{0.099s (±13.53%)}	_{0.100s (±11.91%)}	_~	_0.071s	_0.133s	_{p=0.944 n=12}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=12}
_{Emit Time}	_{1.782s (± 1.50%)}	_{1.796s (± 1.34%)}	_~	_1.736s	_1.882s	_{p=0.312 n=12}
_{Total Time}	_{2.200s (± 1.49%)}	_{2.225s (± 1.32%)}	_~	_2.129s	_2.298s	_{p=0.103 n=12}
_{arktype - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_685,943	_685,943	_~	_~	_~	_{p=1.000 n=12}
_Types	_939,490	_939,490	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{533,256k (± 0.01%)}	_{522,067k (± 0.01%)}	_{-11,189k (- 2.10%)}	_521,900k	_522,313k	_{p=0.000 n=12}
_{Memory Allocs}	_{12,772,285 (± 0.02%)}	_{12,780,417 (± 0.02%)}	_{+8,133 (+ 0.06%)}	_12,777,453	_12,787,750	_{p=0.000 n=12}
_{Config Time}	_{0.003s (± 6.23%)}	_0.003s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.088s (± 4.22%)}	_{0.087s (± 3.24%)}	_~	_0.079s	_0.094s	_{p=0.921 n=12}
_{Bind Time}	_{0.031s (±15.82%)}	_{0.030s (±17.05%)}	_~	_0.023s	_0.042s	_{p=0.443 n=12}
_{Check Time}	_{2.160s (± 0.66%)}	_{2.166s (± 0.39%)}	_~	_2.145s	_2.192s	_{p=0.468 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{2.339s (± 0.40%)}	_{2.335s (± 0.29%)}	_~	_2.321s	_2.352s	_{p=0.723 n=12}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_3,784,027	_3,784,027	_~	_~	_~	_{p=1.000 n=12}
_Types	_1,355,982	_1,355,982	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{2,201,290k (± 0.05%)}	_{2,075,731k (± 0.06%)}	_{🟩-125,559k (- 5.70%)}	_2,071,925k	_2,078,127k	_{p=0.000 n=12}
_{Memory Allocs}	_{26,477,221 (± 0.04%)}	_{26,482,757 (± 0.06%)}	_~	_26,431,010	_26,520,903	_{p=0.410 n=12}
_{Config Time}	_{0.017s (± 1.45%)}	_{0.017s (± 1.07%)}	_~	_0.016s	_0.017s	_{p=1.000 n=12}
_{Parse Time}	_{0.472s (± 3.09%)}	_{0.470s (± 2.96%)}	_~	_0.438s	_0.507s	_{p=0.854 n=12}
_{Bind Time}	_0.002s	_{0.002s (±13.36%)}	_~	_0.001s	_0.002s	_{p=0.478 n=12}
_{Check Time}	_{5.948s (± 0.28%)}	_{5.975s (± 0.33%)}	_~	_5.918s	_6.039s	_{p=0.054 n=12}
_{Emit Time}	_{0.493s (± 8.26%)}	_{0.460s (± 1.91%)}	_{🟩-0.033s (- 6.63%)}	_0.416s	_0.466s	_{p=0.031 n=12}
_{Total Time}	_{7.678s (± 0.44%)}	_{7.682s (± 0.35%)}	_~	_7.609s	_7.746s	_{p=0.702 n=12}
_{sentry - native}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_4,793,249	_4,793,249	_~	_~	_~	_{p=1.000 n=12}
_Types	_2,607,051	_2,607,051	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{3,207,261k (± 0.04%)}	_{3,082,091k (± 0.05%)}	_{🟩-125,170k (- 3.90%)}	_3,078,504k	_3,087,119k	_{p=0.000 n=12}
_{Memory Allocs}	_{75,293,226 (± 0.06%)}	_{75,338,290 (± 0.06%)}	_~	_75,252,714	_75,533,128	_{p=0.114 n=12}
_{Config Time}	_{0.050s (± 0.65%)}	_{0.050s (± 0.49%)}	_~	_0.049s	_0.050s	_{p=0.371 n=12}
_{Parse Time}	_{0.812s (± 2.49%)}	_{0.820s (± 2.31%)}	_~	_0.769s	_0.859s	_{p=0.561 n=12}
_{Bind Time}	_{0.277s (±14.31%)}	_{0.260s (±14.40%)}	_~	_0.214s	_0.381s	_{p=0.484 n=12}
_{Check Time}	_{11.677s (± 0.68%)}	_{11.740s (± 0.78%)}	_~	_11.550s	_12.003s	_{p=0.285 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{12.885s (± 0.68%)}	_{12.936s (± 0.82%)}	_~	_12.724s	_13.256s	_{p=0.478 n=12}
_{social-app - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,883,075	_1,883,075	_~	_~	_~	_{p=1.000 n=12}
_Types	_1,158,171	_1,158,171	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{1,057,546k (± 0.02%)}	_{1,024,558k (± 0.01%)}	_{🟩-32,988k (- 3.12%)}	_1,024,235k	_1,024,883k	_{p=0.000 n=12}
_{Memory Allocs}	_{13,579,919 (± 0.13%)}	_{13,592,055 (± 0.10%)}	_~	_13,563,592	_13,637,108	_{p=0.443 n=12}
_{Config Time}	_{0.017s (± 1.79%)}	_{0.017s (± 1.06%)}	_~	_0.017s	_0.018s	_{p=0.317 n=12}
_{Parse Time}	_{0.354s (± 1.89%)}	_{0.356s (± 1.56%)}	_~	_0.340s	_0.368s	_{p=0.580 n=12}
_{Bind Time}	_{0.084s (±10.87%)}	_{0.078s (± 4.44%)}	_~	_0.074s	_0.091s	_{p=0.431 n=12}
_{Check Time}	_{3.288s (± 0.81%)}	_{3.312s (± 0.54%)}	_~	_3.264s	_3.358s	_{p=0.147 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{3.770s (± 0.46%)}	_{3.788s (± 0.41%)}	_~	_3.749s	_3.833s	_{p=0.235 n=12}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_1,184,976	_1,184,976	_~	_~	_~	_{p=1.000 n=12}
_Types	_438,967	_438,967	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{1,269,438k (± 0.63%)}	_{1,271,124k (± 0.52%)}	_~	_1,252,491k	_1,294,185k	_{p=0.590 n=12}
_{Memory Allocs}	_{77,368,138 (± 0.15%)}	_{77,423,884 (± 0.09%)}	_~	_77,112,458	_77,514,018	_{p=0.887 n=12}
_{Config Time}	_{0.004s (±14.29%)}	_{0.004s (± 9.42%)}	_~	_0.003s	_0.005s	_{p=0.754 n=12}
_{Parse Time}	_{0.310s (± 1.93%)}	_{0.311s (± 1.88%)}	_~	_0.300s	_0.329s	_{p=0.854 n=12}
_{Bind Time}	_{0.000s (±217.90%)}	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{1.946s (± 0.49%)}	_{1.966s (± 0.31%)}	_{+0.020s (+ 1.04%)}	_1.954s	_1.991s	_{p=0.000 n=12}
_{Emit Time}	_{0.381s (± 3.54%)}	_{0.371s (± 3.98%)}	_~	_0.312s	_0.407s	_{p=0.272 n=12}
_{Total Time}	_{23.607s (± 0.44%)}	_{23.613s (± 0.67%)}	_~	_22.986s	_24.004s	_{p=0.843 n=12}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_263,513	_263,513	_~	_~	_~	_{p=1.000 n=12}
_Types	_196,118	_196,118	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{236,086k (± 0.04%)}	_{234,769k (± 0.03%)}	_{-1,317k (- 0.56%)}	_234,569k	_234,899k	_{p=0.000 n=12}
_{Memory Allocs}	_{4,287,251 (± 0.01%)}	_{4,288,795 (± 0.01%)}	_{+1,544 (+ 0.04%)}	_4,288,054	_4,289,465	_{p=0.000 n=12}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.111s (± 4.23%)}	_{0.109s (± 2.82%)}	_~	_0.103s	_0.121s	_{p=0.503 n=12}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Check Time}	_{0.944s (± 0.55%)}	_{0.950s (± 0.46%)}	_~	_0.940s	_0.963s	_{p=0.061 n=12}
_{Emit Time}	_{0.142s (± 5.08%)}	_{0.143s (± 4.91%)}	_~	_0.117s	_0.155s	_{p=0.598 n=12}
_{Total Time}	_{1.251s (± 0.80%)}	_{1.259s (± 0.50%)}	_~	_1.243s	_1.272s	_{p=0.124 n=12}
_{t3code-server - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_4,350,705	_4,350,705	_~	_~	_~	_{p=1.000 n=12}
_Types	_3,040,691	_3,040,691	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{2,610,827k (± 0.02%)}	_{2,540,031k (± 0.02%)}	_{-70,797k (- 2.71%)}	_2,538,617k	_2,542,065k	_{p=0.000 n=12}
_{Memory Allocs}	_{37,334,214 (± 0.06%)}	_{37,376,233 (± 0.05%)}	_{+42,020 (+ 0.11%)}	_37,334,121	_37,430,776	_{p=0.004 n=12}
_{Config Time}	_0.006s	_0.006s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.562s (± 2.64%)}	_{0.588s (± 2.36%)}	_{🔻+0.025s (+ 4.52%)}	_0.538s	_0.617s	_{p=0.013 n=12}
_{Bind Time}	_{0.199s (±15.80%)}	_{0.165s (±12.64%)}	_~	_0.151s	_0.270s	_{p=0.223 n=12}
_{Check Time}	_{16.387s (± 0.32%)}	_{16.353s (± 0.34%)}	_~	_16.176s	_16.524s	_{p=0.477 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{17.170s (± 0.29%)}	_{17.127s (± 0.30%)}	_~	_17.003s	_17.300s	_{p=0.143 n=12}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_231,617	_231,617	_~	_~	_~	_{p=1.000 n=12}
_Types	_181,196	_181,196	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{203,508k (± 0.02%)}	_{202,186k (± 0.02%)}	_{-1,321k (- 0.65%)}	_202,054k	_202,280k	_{p=0.000 n=12}
_{Memory Allocs}	_{1,358,687 (± 0.02%)}	_{1,359,981 (± 0.02%)}	_{+1,294 (+ 0.10%)}	_1,359,214	_1,360,787	_{p=0.000 n=12}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.077s (± 3.60%)}	_{0.077s (± 3.72%)}	_~	_0.070s	_0.086s	_{p=0.988 n=12}
_{Bind Time}	_{0.033s (±10.07%)}	_{0.034s (± 9.54%)}	_~	_0.026s	_0.041s	_{p=0.680 n=12}
_{Check Time}	_{0.607s (± 0.95%)}	_{0.609s (± 0.94%)}	_~	_0.598s	_0.623s	_{p=0.680 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{0.729s (± 0.58%)}	_{0.732s (± 0.64%)}	_~	_0.722s	_0.744s	_{p=0.503 n=12}
_{vscode - native}
_Errors	₁₀	₁₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_7,175,632	_7,175,632	_~	_~	_~	_{p=1.000 n=12}
_Types	_4,223,910	_4,223,910	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{5,355,884k (± 0.02%)}	_{5,226,557k (± 0.02%)}	_{-129,327k (- 2.41%)}	_5,224,873k	_5,229,040k	_{p=0.000 n=12}
_{Memory Allocs}	_{61,923,867 (± 0.03%)}	_{62,008,126 (± 0.01%)}	_{+84,258 (+ 0.14%)}	_61,998,076	_62,032,187	_{p=0.000 n=12}
_{Config Time}	_{0.064s (± 0.38%)}	_{0.064s (± 0.28%)}	_~	_0.064s	_0.065s	_{p=1.000 n=12}
_{Parse Time}	_{1.569s (± 2.34%)}	_{1.533s (± 2.28%)}	_~	_1.467s	_1.644s	_{p=0.124 n=12}
_{Bind Time}	_{0.579s (±13.52%)}	_{0.635s (±14.03%)}	_~	_0.454s	_0.816s	_{p=0.266 n=12}
_{Check Time}	_{14.332s (± 0.79%)}	_{14.381s (± 0.63%)}	_~	_14.251s	_14.643s	_{p=0.340 n=12}
_{Emit Time}	_{4.848s (± 8.43%)}	_{5.158s (± 8.31%)}	_~	_4.098s	_5.695s	_{p=0.139 n=12}
_{Total Time}	_{21.469s (± 1.75%)}	_{21.851s (± 1.82%)}	_~	_20.784s	_22.416s	_{p=0.052 n=12}
_{webpack - native}
_Errors	₆₀₂	₆₀₂	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_910,191	_910,191	_~	_~	_~	_{p=1.000 n=12}
_Types	_629,514	_629,514	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{745,108k (± 0.02%)}	_{738,608k (± 0.02%)}	_{-6,500k (- 0.87%)}	_738,182k	_738,814k	_{p=0.000 n=12}
_{Memory Allocs}	_{6,442,672 (± 0.01%)}	_{6,452,279 (± 0.04%)}	_{+9,607 (+ 0.15%)}	_6,449,026	_6,460,253	_{p=0.000 n=12}
_{Config Time}	_0.009s	_0.009s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.313s (± 3.28%)}	_{0.319s (± 3.12%)}	_~	_0.293s	_0.343s	_{p=0.370 n=12}
_{Bind Time}	_{0.077s (± 6.77%)}	_{0.084s (±12.45%)}	_~	_0.071s	_0.128s	_{p=0.433 n=12}
_{Check Time}	_{2.683s (± 0.37%)}	_{2.688s (± 0.43%)}	_~	_2.650s	_2.712s	_{p=0.451 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{3.119s (± 0.42%)}	_{3.139s (± 0.44%)}	_~	_3.113s	_3.181s	_{p=0.097 n=12}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=12}
_Symbols	_640,494	_640,494	_~	_~	_~	_{p=1.000 n=12}
_Types	_387,992	_387,992	_~	_~	_~	_{p=1.000 n=12}
_{Memory Used}	_{398,604k (± 0.02%)}	_{386,020k (± 0.05%)}	_{🟩-12,584k (- 3.16%)}	_385,747k	_386,712k	_{p=0.000 n=12}
_{Memory Allocs}	_{3,993,574 (± 0.09%)}	_{3,998,519 (± 0.07%)}	_{+4,945 (+ 0.12%)}	_3,992,354	_4,005,221	_{p=0.033 n=12}
_{Config Time}	_0.003s	_0.003s	_~	_~	_~	_{p=1.000 n=12}
_{Parse Time}	_{0.137s (± 2.67%)}	_{0.138s (± 4.27%)}	_~	_0.121s	_0.152s	_{p=0.680 n=12}
_{Bind Time}	_{0.037s (± 8.22%)}	_{0.044s (±17.29%)}	_{🔻+0.006s (+17.26%)}	_0.034s	_0.070s	_{p=0.043 n=12}
_{Check Time}	_{0.946s (± 0.64%)}	_{0.953s (± 0.42%)}	_{+0.007s (+ 0.71%)}	_0.944s	_0.966s	_{p=0.043 n=12}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=12}
_{Total Time}	_{1.131s (± 0.88%)}	_{1.146s (± 0.73%)}	_{+0.015s (+ 1.30%)}	_1.122s	_1.175s	_{p=0.018 n=12}

System info unknown

Hosts

native

Scenarios

Compiler-Unions - native
angular-1 - native
arktype - native
mui-docs - native
sentry - native
social-app - native
strada-build-src - native
strada-compiler - native
t3code-server - native
ts-pre-modules - native
vscode - native
webpack - native
xstate-main - native

_Benchmark	_Name	_Iterations
_Current	_pr	₁₂
_Baseline	_baseline	₁₂

lsp

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{CompilerLSP - native}
_{Req 1 - updateOpen}	_{10ms (± 1.83%)}	_{11ms (±11.30%)}	_~	_10ms	_15ms	_{p=0.261 n=12}
_{Req 2 - geterr}	_{282ms (± 0.75%)}	_{285ms (± 0.57%)}	_{+3ms (+ 1.12%)}	_280ms	_289ms	_{p=0.021 n=12}
_{Req 3 - references}	_{49ms (± 1.61%)}	_{49ms (± 1.73%)}	_~	_48ms	_52ms	_{p=0.197 n=12}
_{Req 4 - navto}	_{18ms (± 7.63%)}	_{18ms (± 6.60%)}	_~	_16ms	_23ms	_{p=0.560 n=12}
_{Req 5 - completionInfo count}	_1,525	_1,525	_~	_~	_~	_{p=1.000 n=12}
_{Req 5 - completionInfo}	_{19ms (±12.63%)}	_{20ms (±12.21%)}	_~	_15ms	_24ms	_{p=0.696 n=12}
_{Compiler-UnionsLSP - native}
_{Req 1 - updateOpen}	_{13ms (±13.04%)}	_{14ms (±11.89%)}	_~	_11ms	_17ms	_{p=0.140 n=12}
_{Req 2 - geterr}	_{666ms (± 0.54%)}	_{671ms (± 0.37%)}	_{+5ms (+ 0.81%)}	_663ms	_675ms	_{p=0.016 n=12}
_{Req 3 - references}	_{56ms (± 4.90%)}	_{54ms (± 4.99%)}	_~	_50ms	_60ms	_{p=0.395 n=12}
_{Req 4 - navto}	_{20ms (± 6.63%)}	_{19ms (± 0.95%)}	_~	_19ms	_20ms	_{p=0.876 n=12}
_{Req 5 - completionInfo count}	_1,363	_1,363	_~	_~	_~	_{p=1.000 n=12}
_{Req 5 - completionInfo}	_{18ms (± 5.54%)}	_{19ms (± 5.81%)}	_~	_16ms	_21ms	_{p=0.126 n=12}
_{xstate-main-1-LSP - native}
_{⚠️ Failed}	_failed	_failed

System info unknown

Hosts

native

Scenarios

CompilerLSP - native
Compiler-UnionsLSP - native
xstate-main-1-LSP - native

_Benchmark	_Name	_Iterations
_Current	_pr	₁₂
_Baseline	_baseline	₁₂

startup

Comparison Report - baseline..pr

_Metric	_baseline	_pr
_{lsp-startup - native}
_{⚠️ Failed}	_failed	_failed
_{tsgo-startup - native}
_{⚠️ Failed}	_failed	_failed

System info unknown

Hosts

native

Scenarios

lsp-startup - native
tsgo-startup - native

_Benchmark	_Name	_Iterations
_Current	_pr	₁₂
_Baseline	_baseline	₁₂

Developer Information:

Download Benchmarks

typescript-automation Bot assigned Jake Bailey (jakebailey) Oct 13, 2026

typescript-automation Bot added Author: Team For Uncommitted Bug PR for untriaged, rejected, closed or missing bug labels Oct 13, 2026

Jake Bailey (jakebailey) added this pull request to stack #64792 October 13, 2026 17:37

Jake Bailey (jakebailey) mentioned this pull request Oct 13, 2026

Various memory optimizations #64734

Closed

Jake Bailey (jakebailey) marked this pull request as ready for review October 13, 2026 17:42

Copilot AI balanced review requested due to automatic review settings October 13, 2026 17:42

Copilot started reviewing on behalf of Jake Bailey (jakebailey) October 13, 2026 17:43

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Jake Bailey (jakebailey) marked this pull request as draft October 13, 2026 19:40

Jake Bailey (jakebailey) force-pushed the jakebailey/mem/cold-value-symbol-links branch from 0b88a7d to 744eb18 Compare October 13, 2026 20:06

Jake Bailey (jakebailey) force-pushed the jakebailey/mem/compact-member-indexes branch from 7f33389 to 5aa1029 Compare October 13, 2026 20:06

Base automatically changed from jakebailey/mem/cold-value-symbol-links to jakebailey/mem/compressed-link-stores October 13, 2026 20:06

Jake Bailey (jakebailey) removed this pull request from stack #64792 October 13, 2026 20:15

Jake Bailey (jakebailey) added this pull request to stack #64805 October 13, 2026 20:16

Jake Bailey (jakebailey) removed this pull request from stack #64805 October 13, 2026 20:49

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Jake Bailey (jakebailey) added this pull request to stack #64806 October 13, 2026 20:50

Jake Bailey (jakebailey) requested a balanced review from Copilot October 13, 2026 21:12

Copilot started reviewing on behalf of Jake Bailey (jakebailey) October 13, 2026 21:12

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Copilot AI reviewed Oct 13, 2026

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Jake Bailey (jakebailey) force-pushed the jakebailey/mem/compressed-link-stores branch from bce1b47 to 83bb2cc Compare October 13, 2026 21:39

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Jake Bailey (jakebailey) force-pushed the jakebailey/mem/compact-member-indexes branch from 48d2bb2 to f2431d1 Compare October 13, 2026 23:08

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Jake Bailey (jakebailey) force-pushed the jakebailey/mem/compact-member-indexes branch 3 times, most recently from bf46f3e to c4938e8 Compare October 14, 2026 02:23

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Jake Bailey (jakebailey) force-pushed the jakebailey/mem/compact-member-indexes branch from c4938e8 to 22ec779 Compare October 14, 2026 02:27

Jake Bailey (jakebailey) force-pushed the jakebailey/mem/compressed-link-stores branch from e4a3be8 to 67c649a Compare October 14, 2026 03:47

Jake Bailey (jakebailey) force-pushed the jakebailey/mem/compact-member-indexes branch from 22ec779 to 3654528 Compare October 14, 2026 03:47

Anders Hejlsberg (ahejlsberg) force-pushed the jakebailey/mem/compact-member-indexes branch from 3654528 to 7265ad1 Compare October 14, 2026 14:14

Jake Bailey (jakebailey) force-pushed the jakebailey/mem/compressed-link-stores branch from b9d52d7 to 5f4fd97 Compare October 14, 2026 14:17

Jake Bailey (jakebailey) force-pushed the jakebailey/mem/compact-member-indexes branch 2 times, most recently from 04c2a42 to 15e8050 Compare October 14, 2026 16:02

Jake Bailey (jakebailey) removed this pull request from stack #64806 October 14, 2026 16:55

Jake Bailey (jakebailey) changed the base branch from jakebailey/mem/compressed-link-stores to main October 14, 2026 16:56

Jake Bailey (jakebailey) force-pushed the jakebailey/mem/compact-member-indexes branch from 15e8050 to a4b4d1d Compare October 14, 2026 16:56

Jake Bailey (jakebailey) marked this pull request as ready for review October 14, 2026 16:57

Jake Bailey (jakebailey) marked this pull request as draft October 16, 2026 22:44

Jake Bailey (jakebailey) force-pushed the jakebailey/mem/compact-member-indexes branch from a4b4d1d to 1f6c99a Compare October 25, 2026 00:19

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Index checker members without redundant symbol maps - #64781

Index checker members without redundant symbol maps#64781
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jakebailey/mem/compact-member-indexes

Jake Bailey (jakebailey) commented Oct 13, 2026 •

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Jake Bailey (jakebailey) commented Oct 14, 2026

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typescript-automation Bot commented Oct 14, 2026 •

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typescript-automation Bot commented Oct 14, 2026

tsc

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Jake Bailey (jakebailey) commented Oct 25, 2026

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typescript-automation Bot commented Oct 25, 2026 •

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tsc

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Jake Bailey (jakebailey) commented Oct 13, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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🟡 Changes recommended

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🔵 Needs a closer look

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Jake Bailey (jakebailey) commented Oct 14, 2026

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typescript-automation Bot commented Oct 14, 2026

tsc

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Jake Bailey (jakebailey) commented Oct 25, 2026

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Jake Bailey (jakebailey) commented Oct 13, 2026 •

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typescript-automation Bot commented Oct 14, 2026 •

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typescript-automation Bot commented Oct 25, 2026 •

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