Inline the common fast-fail of isSimpleTypeRelatedTo by jakebailey · Pull Request #65038 · microsoft/TypeScript

Jake Bailey (jakebailey) · 2026-10-29T21:26:54Z

isSimpleTypeRelatedTo is called up to twice for nearly every relation check, and in the overwhelmingly common case (relating two structured or instantiable types where the target is not a union) it walks a long list of primitive flag tests only to return false. The function was far too large to inline, so each of those checks also paid for a call.

Split it into a small wrapper that fits the inlining budget and rejects that case directly, and a worker holding the full logic. The worker additionally short-circuits two cases whose outcome is already decided by a couple of flag tests: two enum members of the same kind, and two structured or instantiable types (where only the unknown-like union check can apply). Results are unchanged.

Thanks Steven (@teamchong) for finding this!

isSimpleTypeRelatedTo is called up to twice for nearly every relation check, and in the overwhelmingly common case (relating two structured or instantiable types where the target is not a union) it walks a long list of primitive flag tests only to return false. The function was far too large to inline, so each of those checks also paid for a call. Split it into a small wrapper that fits the inlining budget and rejects that case directly, and a worker holding the full logic. The worker additionally short-circuits two cases whose outcome is already decided by a couple of flag tests: two enum members of the same kind, and two structured or instantiable types (where only the unknown-like union check can apply). Results are unchanged. Co-authored-by: Steven Chong <25894545+teamchong@users.noreply.github.com>

Jake Bailey (jakebailey) · 2026-10-29T21:27:08Z

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

typescript-automation · 2026-10-29T21:27:14Z

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

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

Copilot

🟢 Approval recommended

No active review issues were identified in the type-relation fast-path refactor.

No open issues 🎉

What changed in this PR

Optimizes the native compiler’s type-relation checks by moving the common fast-fail path into a small, inlineable wrapper, while preserving the existing relation logic.

Changes:

Splits isSimpleTypeRelatedTo into a wrapper and a worker.
Adds early exits for matching-kind enum members and structured or instantiable types.

File	Description
`tsc/internal/checker/relater.go`	Adds fast paths to reduce function-call overhead and unnecessary primitive flag checks.

_{Review effort: Balanced}

typescript-automation · 2026-10-29T22:37:27Z

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=20}
_Symbols	_88,466	_88,466	_~	_~	_~	_{p=1.000 n=20}
_Types	_79,607	_79,607	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{104,178k (± 0.03%)}	_{104,136k (± 0.02%)}	_~	_104,045k	_104,218k	_{p=0.062 n=20}
_{Memory Allocs}	_{1,263,837 (± 0.01%)}	_{1,263,922 (± 0.01%)}	_~	_1,263,481	_1,264,509	_{p=0.383 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.023s (± 2.84%)}	_{0.023s (± 2.66%)}	_~	_0.021s	_0.026s	_{p=0.268 n=20}
_{Bind Time}	_{0.009s (± 4.57%)}	_{0.009s (± 4.07%)}	_~	_0.008s	_0.011s	_{p=0.232 n=20}
_{Check Time}	_{0.218s (± 0.57%)}	_{0.209s (± 0.76%)}	_{🟩-0.009s (- 4.04%)}	_0.204s	_0.216s	_{p=0.000 n=20}
_{Emit Time}	_{0.144s (± 0.70%)}	_{0.141s (± 1.02%)}	_{-0.002s (- 1.57%)}	_0.135s	_0.145s	_{p=0.025 n=20}
_{Total Time}	_{0.397s (± 0.51%)}	_{0.386s (± 0.39%)}	_{-0.010s (- 2.62%)}	_0.380s	_0.392s	_{p=0.000 n=20}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_{586,500 (± 0.02%)}	_{586,501 (± 0.02%)}	_~	_586,106	_586,827	_{p=0.963 n=20}
_Types	_{241,688 (± 0.00%)}	_{241,687 (± 0.00%)}	_~	_241,683	_241,697	_{p=0.169 n=20}
_{Memory Used}	_{517,917k (± 0.02%)}	_{517,936k (± 0.02%)}	_~	_517,643k	_518,360k	_{p=0.482 n=20}
_{Memory Allocs}	_{7,798,729 (± 0.11%)}	_{7,804,289 (± 0.12%)}	_~	_7,785,888	_7,851,277	_{p=0.242 n=20}
_{Config Time}	_0.009s	_0.009s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.126s (± 2.79%)}	_{0.128s (± 2.52%)}	_~	_0.116s	_0.142s	_{p=0.371 n=20}
_{Bind Time}	_{0.046s (± 9.84%)}	_{0.047s (±11.03%)}	_~	_0.038s	_0.068s	_{p=0.787 n=20}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=20}
_{Emit Time}	_{0.854s (± 1.08%)}	_{0.853s (± 1.09%)}	_~	_0.824s	_0.881s	_{p=0.984 n=20}
_{Total Time}	_{1.045s (± 1.25%)}	_{1.049s (± 1.35%)}	_~	_1.010s	_1.092s	_{p=0.825 n=20}
_{arktype - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_685,920	_685,920	_~	_~	_~	_{p=1.000 n=20}
_Types	_939,467	_939,467	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{497,271k (± 0.01%)}	_{497,292k (± 0.01%)}	_~	_497,131k	_497,508k	_{p=0.825 n=20}
_{Memory Allocs}	_{12,109,421 (± 0.02%)}	_{12,108,253 (± 0.01%)}	_~	_12,104,526	_12,117,478	_{p=0.565 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.043s (± 3.29%)}	_{0.043s (± 3.26%)}	_~	_0.038s	_0.049s	_{p=0.866 n=20}
_{Bind Time}	_{0.014s (± 9.96%)}	_{0.013s (± 7.39%)}	_~	_0.012s	_0.020s	_{p=0.901 n=20}
_{Check Time}	_{1.011s (± 1.35%)}	_{1.009s (± 1.54%)}	_~	_0.968s	_1.075s	_{p=0.899 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.099s (± 1.26%)}	_{1.095s (± 1.43%)}	_~	_1.052s	_1.166s	_{p=0.616 n=20}
_{class-transformer - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_45,376	_45,376	_~	_~	_~	_{p=1.000 n=20}
_Types	_7,573	_7,573	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{27,838k (± 0.03%)}	_{27,834k (± 0.02%)}	_~	_27,817k	_27,847k	_{p=0.783 n=20}
_{Memory Allocs}	_{248,687 (± 0.08%)}	_{248,812 (± 0.06%)}	_~	_248,138	_249,353	_{p=0.221 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.011s (± 3.83%)}	_{0.011s (± 4.28%)}	_~	_0.009s	_0.014s	_{p=0.284 n=20}
_{Bind Time}	_{0.004s (±10.85%)}	_{0.003s (±10.34%)}	_~	_0.003s	_0.006s	_{p=0.582 n=20}
_{Check Time}	_{0.008s (± 7.97%)}	_{0.008s (± 5.79%)}	_~	_0.007s	_0.011s	_{p=0.810 n=20}
_{Emit Time}	_{0.009s (± 7.13%)}	_{0.009s (± 4.50%)}	_~	_0.007s	_0.010s	_{p=0.802 n=20}
_{Total Time}	_{0.032s (± 2.78%)}	_{0.033s (± 2.11%)}	_~	_0.030s	_0.036s	_{p=0.178 n=20}
_{effect - native}
_Errors	₁₂	₁₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,235,115	_1,235,115	_~	_~	_~	_{p=1.000 n=20}
_Types	_894,113	_894,113	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{940,543k (± 0.02%)}	_{940,604k (± 0.02%)}	_~	_939,888k	_941,349k	_{p=0.738 n=20}
_{Memory Allocs}	_{12,673,963 (± 0.03%)}	_{12,672,100 (± 0.03%)}	_~	_12,662,403	_12,695,584	_{p=0.547 n=20}
_{Config Time}	_0.002s	_0.002s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.150s (± 1.87%)}	_{0.147s (± 1.57%)}	_~	_0.136s	_0.157s	_{p=0.086 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.955s (± 4.04%)}	_{0.946s (± 1.52%)}	_~	_0.906s	_1.018s	_{p=0.723 n=20}
_{Emit Time}	_{0.519s (± 2.33%)}	_{0.512s (± 2.45%)}	_~	_0.471s	_0.556s	_{p=0.433 n=20}
_{Total Time}	_{1.721s (± 2.59%)}	_{1.701s (± 1.26%)}	_~	_1.639s	_1.793s	_{p=0.878 n=20}
_{mui-docs - native}
_Errors	_11,405	_11,405	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_3,784,019	_3,784,019	_~	_~	_~	_{p=1.000 n=20}
_Types	_1,355,974	_1,355,974	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{1,837,004k (± 0.07%)}	_{1,836,561k (± 0.08%)}	_~	_1,830,969k	_1,841,800k	_{p=0.602 n=20}
_{Memory Allocs}	_{25,999,101 (± 0.08%)}	_{25,972,164 (± 0.09%)}	_{-26,937 (- 0.10%)}	_25,920,150	_26,118,889	_{p=0.023 n=20}
_{Config Time}	_0.008s	_0.008s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.298s (± 1.15%)}	_{0.303s (± 2.14%)}	_~	_0.283s	_0.345s	_{p=0.783 n=20}
_{Bind Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{3.075s (± 1.11%)}	_{3.045s (± 0.53%)}	_~	_3.000s	_3.117s	_{p=0.189 n=20}
_{Emit Time}	_{0.238s (± 0.84%)}	_{0.241s (± 1.28%)}	_~	_0.231s	_0.257s	_{p=0.111 n=20}
_{Total Time}	_{4.118s (± 0.91%)}	_{4.087s (± 0.43%)}	_~	_4.039s	_4.181s	_{p=0.298 n=20}
_{sentry - native}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,793,245	_4,793,245	_~	_~	_~	_{p=1.000 n=20}
_Types	_2,607,045	_2,607,045	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{2,880,745k (± 0.03%)}	_{2,881,605k (± 0.04%)}	_~	_2,877,976k	_2,887,596k	_{p=0.478 n=20}
_{Memory Allocs}	_{75,267,525 (± 0.21%)}	_{75,462,391 (± 0.37%)}	_~	_74,747,405	_77,167,986	_{p=0.640 n=20}
_{Config Time}	_{0.026s (± 1.91%)}	_{0.026s (± 1.50%)}	_~	_0.024s	_0.027s	_{p=0.238 n=20}
_{Parse Time}	_{0.490s (± 2.83%)}	_{0.515s (± 5.53%)}	_~	_0.444s	_0.667s	_{p=0.507 n=20}
_{Bind Time}	_{0.174s (±10.13%)}	_{0.174s (±12.01%)}	_~	_0.139s	_0.297s	_{p=0.597 n=20}
_{Check Time}	_{7.050s (± 0.87%)}	_{6.939s (± 1.04%)}	_{-0.112s (- 1.58%)}	_6.639s	_7.209s	_{p=0.038 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{7.793s (± 0.77%)}	_{7.704s (± 0.97%)}	_~	_7.429s	_8.050s	_{p=0.085 n=20}
_{social-app - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,883,074	_1,883,074	_~	_~	_~	_{p=1.000 n=20}
_Types	_1,158,168	_1,158,168	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{972,513k (± 0.01%)}	_{972,396k (± 0.01%)}	_~	_971,395k	_972,833k	_{p=0.337 n=20}
_{Memory Allocs}	_{13,579,418 (± 0.10%)}	_{13,577,771 (± 0.16%)}	_~	_13,528,844	_13,685,357	_{p=0.314 n=20}
_{Config Time}	_{0.008s (± 1.31%)}	_0.008s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.163s (± 3.73%)}	_{0.162s (± 2.70%)}	_~	_0.149s	_0.184s	_{p=0.835 n=20}
_{Bind Time}	_{0.048s (±10.17%)}	_{0.049s (± 8.44%)}	_~	_0.042s	_0.074s	_{p=0.638 n=20}
_{Check Time}	_{1.602s (± 1.24%)}	_{1.610s (± 1.22%)}	_~	_1.545s	_1.719s	_{p=0.763 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.840s (± 1.09%)}	_{1.849s (± 1.11%)}	_~	_1.775s	_1.968s	_{p=0.713 n=20}
_{strada-build-src - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_1,184,972	_1,184,972	_~	_~	_~	_{p=1.000 n=20}
_Types	_438,963	_438,963	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{1,167,220k (± 0.29%)}	_{1,166,515k (± 0.27%)}	_~	_1,149,275k	_1,184,342k	_{p=0.779 n=20}
_{Memory Allocs}	_{47,675,090 (± 0.12%)}	_{47,709,861 (± 0.10%)}	_~	_47,490,358	_47,860,307	_{p=0.211 n=20}
_{Config Time}	_{0.002s (±18.96%)}	_{0.002s (±14.66%)}	_~	_0.001s	_0.003s	_{p=0.552 n=20}
_{Parse Time}	_{0.140s (± 1.63%)}	_{0.141s (± 2.09%)}	_~	_0.130s	_0.160s	_{p=0.825 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.818s (± 0.91%)}	_{0.807s (± 0.70%)}	_{-0.011s (- 1.34%)}	_0.792s	_0.839s	_{p=0.014 n=20}
_{Emit Time}	_{0.142s (± 1.30%)}	_{0.143s (± 1.65%)}	_~	_0.134s	_0.156s	_{p=0.845 n=20}
_{Total Time}	_{9.497s (± 0.84%)}	_{9.399s (± 0.77%)}	_{-0.098s (- 1.03%)}	_9.189s	_9.775s	_{p=0.029 n=20}
_{strada-compiler - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_263,511	_263,511	_~	_~	_~	_{p=1.000 n=20}
_Types	_196,116	_196,116	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{224,586k (± 0.02%)}	_{224,609k (± 0.02%)}	_~	_224,473k	_224,785k	_{p=0.784 n=20}
_{Memory Allocs}	_{2,401,286 (± 0.01%)}	_{2,401,668 (± 0.01%)}	_~	_2,400,440	_2,403,467	_{p=0.133 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.052s (± 3.13%)}	_{0.049s (± 2.53%)}	_{🟩-0.002s (- 4.45%)}	_0.046s	_0.056s	_{p=0.047 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.383s (± 1.15%)}	_{0.375s (± 0.90%)}	_{-0.008s (- 2.14%)}	_0.366s	_0.392s	_{p=0.005 n=20}
_{Emit Time}	_{0.050s (± 5.63%)}	_{0.049s (± 5.72%)}	_~	_0.042s	_0.057s	_{p=0.845 n=20}
_{Total Time}	_{0.513s (± 0.95%)}	_{0.502s (± 0.83%)}	_{-0.011s (- 2.22%)}	_0.488s	_0.525s	_{p=0.001 n=20}
_{t3code-server - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_4,350,661	_4,350,661	_~	_~	_~	_{p=1.000 n=20}
_Types	_3,040,644	_3,040,644	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{2,433,577k (± 0.02%)}	_{2,433,934k (± 0.03%)}	_~	_2,431,832k	_2,437,630k	_{p=0.698 n=20}
_{Memory Allocs}	_{37,388,199 (± 0.10%)}	_{37,386,574 (± 0.09%)}	_~	_37,293,712	_37,595,825	_{p=0.883 n=20}
_{Config Time}	_0.003s	_0.003s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.260s (± 2.52%)}	_{0.257s (± 1.97%)}	_~	_0.240s	_0.279s	_{p=0.310 n=20}
_{Bind Time}	_{0.095s (±11.52%)}	_{0.084s (± 6.30%)}	_~	_0.077s	_0.118s	_{p=0.103 n=20}
_{Check Time}	_{7.350s (± 0.75%)}	_{7.295s (± 0.38%)}	_~	_7.189s	_7.446s	_{p=0.073 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{7.717s (± 0.69%)}	_{7.651s (± 0.38%)}	_{-0.067s (- 0.86%)}	_7.523s	_7.802s	_{p=0.023 n=20}
_{tanstack-router - native}
_Errors	₁	₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_571,756	_571,756	_~	_~	_~	_{p=1.000 n=20}
_Types	_397,689	_397,689	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{331,446k (± 0.02%)}	_{331,433k (± 0.02%)}	_~	_331,163k	_331,767k	_{p=0.693 n=20}
_{Memory Allocs}	_{4,391,084 (± 0.14%)}	_{4,388,352 (± 0.11%)}	_~	_4,378,066	_4,412,473	_{p=0.445 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.039s (± 4.31%)}	_{0.040s (± 3.41%)}	_~	_0.037s	_0.045s	_{p=0.462 n=20}
_{Bind Time}	_{0.015s (±10.25%)}	_{0.012s (± 4.66%)}	_{🟩-0.003s (-19.06%)}	_0.011s	_0.015s	_{p=0.001 n=20}
_{Check Time}	_{0.587s (± 0.57%)}	_{0.584s (± 0.77%)}	_~	_0.572s	_0.611s	_{p=0.297 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.660s (± 0.68%)}	_{0.657s (± 0.87%)}	_~	_0.642s	_0.685s	_{p=0.417 n=20}
_{ts-pre-modules - native}
_Errors	₈₇	₈₇	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_231,616	_231,616	_~	_~	_~	_{p=1.000 n=20}
_Types	_181,195	_181,195	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{193,537k (± 0.01%)}	_{193,529k (± 0.01%)}	_~	_193,457k	_193,664k	_{p=0.507 n=20}
_{Memory Allocs}	_{1,318,062 (± 0.01%)}	_{1,318,404 (± 0.02%)}	_{+342 (+ 0.03%)}	_1,317,794	_1,319,596	_{p=0.047 n=20}
_{Config Time}	_0.000s	_{0.000s (±208.60%)}	_~	_0.000s	_0.001s	_{p=1.000 n=20}
_{Parse Time}	_{0.043s (± 2.84%)}	_{0.044s (± 3.89%)}	_~	_0.038s	_0.051s	_{p=0.348 n=20}
_{Bind Time}	_{0.021s (± 4.98%)}	_{0.021s (± 6.41%)}	_~	_0.017s	_0.026s	_{p=0.307 n=20}
_{Check Time}	_{0.295s (± 1.14%)}	_{0.291s (± 0.78%)}	_~	_0.282s	_0.299s	_{p=0.062 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.366s (± 0.79%)}	_{0.362s (± 0.73%)}	_~	_0.353s	_0.372s	_{p=0.077 n=20}
_{vscode - native}
_Errors	₁₁	₁₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_7,504,980	_7,504,980	_~	_~	_~	_{p=1.000 n=20}
_Types	_4,419,852	_4,419,852	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{5,214,565k (± 0.02%)}	_{5,215,729k (± 0.02%)}	_~	_5,211,984k	_5,220,455k	_{p=0.134 n=20}
_{Memory Allocs}	_{57,128,552 (± 0.03%)}	_{57,124,782 (± 0.03%)}	_~	_57,096,179	_57,191,377	_{p=0.820 n=20}
_{Config Time}	_{0.035s (± 1.88%)}	_{0.035s (± 2.25%)}	_~	_0.032s	_0.038s	_{p=0.727 n=20}
_{Parse Time}	_{0.914s (± 2.15%)}	_{0.938s (± 1.27%)}	_~	_0.897s	_1.022s	_{p=0.062 n=20}
_{Bind Time}	_{0.330s (± 7.59%)}	_{0.312s (± 2.94%)}	_~	_0.294s	_0.374s	_{p=0.273 n=20}
_{Check Time}	_{7.514s (± 1.10%)}	_{7.554s (± 1.15%)}	_~	_7.259s	_7.797s	_{p=0.534 n=20}
_{Emit Time}	_{2.853s (± 5.87%)}	_{2.713s (± 2.10%)}	_~	_2.587s	_3.155s	_{p=0.635 n=20}
_{Total Time}	_{11.707s (± 1.96%)}	_{11.610s (± 1.27%)}	_~	_11.174s	_12.328s	_{p=0.764 n=20}
_{webpack - native}
_Errors	₆₁₆	₆₁₆	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_917,188	_917,188	_~	_~	_~	_{p=1.000 n=20}
_Types	_636,859	_636,859	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{693,547k (± 0.02%)}	_{693,412k (± 0.02%)}	_~	_693,108k	_693,877k	_{p=0.098 n=20}
_{Memory Allocs}	_{6,499,249 (± 0.04%)}	_{6,500,259 (± 0.04%)}	_~	_6,492,983	_6,515,777	_{p=0.398 n=20}
_{Config Time}	_0.004s	_0.004s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.147s (± 3.26%)}	_{0.142s (± 3.65%)}	_~	_0.124s	_0.167s	_{p=0.064 n=20}
_{Bind Time}	_{0.043s (± 8.29%)}	_{0.044s (± 9.50%)}	_~	_0.037s	_0.070s	_{p=0.835 n=20}
_{Check Time}	_{1.152s (± 0.91%)}	_{1.148s (± 1.34%)}	_~	_1.114s	_1.236s	_{p=0.194 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.369s (± 1.03%)}	_{1.361s (± 1.43%)}	_~	_1.316s	_1.456s	_{p=0.176 n=20}
_{xstate-main - native}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_640,490	_640,490	_~	_~	_~	_{p=1.000 n=20}
_Types	_387,984	_387,984	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{350,939k (± 0.02%)}	_{350,897k (± 0.02%)}	_~	_350,726k	_351,521k	_{p=0.341 n=20}
_{Memory Allocs}	_{3,991,706 (± 0.13%)}	_{3,991,162 (± 0.09%)}	_~	_3,980,657	_4,008,421	_{p=0.883 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.064s (± 3.36%)}	_{0.065s (± 3.34%)}	_~	_0.059s	_0.073s	_{p=0.335 n=20}
_{Bind Time}	_{0.022s (± 9.97%)}	_{0.022s (± 9.70%)}	_~	_0.018s	_0.034s	_{p=0.770 n=20}
_{Check Time}	_{0.428s (± 0.88%)}	_{0.425s (± 1.04%)}	_~	_0.409s	_0.444s	_{p=0.350 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.519s (± 0.97%)}	_{0.519s (± 1.09%)}	_~	_0.502s	_0.542s	_{p=0.920 n=20}

System info unknown

Hosts

native

Scenarios

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

_Benchmark	_Name	_Iterations
_Current	_pr	₂₀
_Baseline	_baseline	₂₀

Developer Information:

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github-project-automation Bot added this to PR Backlog Oct 29, 2026

Copilot AI balanced review requested due to automatic review settings October 29, 2026 21:26

typescript-automation Bot assigned Jake Bailey (jakebailey) Oct 29, 2026

github-project-automation Bot moved this to Not started in PR Backlog Oct 29, 2026

typescript-automation Bot added Author: Team For Uncommitted Bug PR for untriaged, rejected, closed or missing bug labels Oct 29, 2026

Copilot started reviewing on behalf of Jake Bailey (jakebailey) October 29, 2026 21:27

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Jake Bailey (jakebailey) added the Domain: Performance Reports of unusually slow behavior label Oct 29, 2026

Ryan Cavanaugh (RyanCavanaugh) approved these changes Oct 30, 2026

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github-project-automation Bot moved this from Not started to Needs merge in PR Backlog Oct 30, 2026

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Inline the common fast-fail of isSimpleTypeRelatedTo - #65038

Inline the common fast-fail of isSimpleTypeRelatedTo#65038
Jake Bailey (jakebailey) wants to merge 1 commit into
microsoft:mainfrom
jakebailey:perf/relation-helpers

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