Split link store lookups into inlineable fast paths by jakebailey · Pull Request #65019 · microsoft/TypeScript

Jake Bailey (jakebailey) · 2026-10-29T20:00:04Z

LinkStore.Get and PagedLinkStore.Get are called on nearly every checker link access, and almost all of those calls hit an existing entry. Both methods also contained the code to create the entry (allocating the map or growing the page list, allocating a page, and allocating the value from the arena), which made them too large for the Go compiler to inline, so every hit paid for a full call.

Move the creation logic into out-of-line getSlow methods so that Get only does the lookup and falls back to getSlow on a miss. The goal is for the hit path to be inlined at call sites: LinkStore.Get now fits within the default inlining budget, and the smaller PagedLinkStore.Get body is cheaper to inline at the hot call sites that PGO selects.

Thanks Steven (@teamchong) for finding this!

LinkStore.Get and PagedLinkStore.Get are called on nearly every checker link access, and almost all of those calls hit an existing entry. Both methods also contained the code to create the entry (allocating the map or growing the page list, allocating a page, and allocating the value from the arena), which made them too large for the Go compiler to inline, so every hit paid for a full call. Move the creation logic into out-of-line getSlow methods so that Get only does the lookup and falls back to getSlow on a miss. The goal is for the hit path to be inlined at call sites: LinkStore.Get now fits within the default inlining budget, and the smaller PagedLinkStore.Get body is cheaper to inline at the hot call sites that PGO selects. Co-authored-by: Steven Chong <25894545+teamchong@users.noreply.github.com>

Jake Bailey (jakebailey) · 2026-10-29T20:01:32Z

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

typescript-automation · 2026-10-29T20:01:38Z

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

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

Copilot

🟢 Approval recommended

The review reports no active issues with the link-store lookup and allocation refactor.

No open issues 🎉

What changed in this PR

This PR separates existing-entry lookups from allocation logic in the compiler’s link stores, making frequent checker link accesses more amenable to Go inlining.

Changes:

Keeps LinkStore.Get focused on lookup, moving entry creation into getSlow.
Uses TryGet for the PagedLinkStore.Get fast path and moves page growth and allocation into getSlow.

File	Description
`tsc/internal/core/linkstore.go`	Splits both link-store getters into compact lookup paths and separate creation paths.

_{Review effort: Balanced}

typescript-automation · 2026-10-29T20:58:45Z

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}	_{104,166k (± 0.03%)}	_{104,142k (± 0.02%)}	_~	_104,043k	_104,240k	_{p=0.402 n=20}
_{Memory Allocs}	_{1,263,841 (± 0.01%)}	_{1,263,804 (± 0.01%)}	_~	_1,263,512	_1,264,137	_{p=0.698 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.022s (± 2.82%)}	_{0.023s (± 2.23%)}	_~	_0.021s	_0.025s	_{p=0.261 n=20}
_{Bind Time}	_{0.009s (± 6.34%)}	_{0.009s (± 5.86%)}	_~	_0.007s	_0.011s	_{p=0.942 n=20}
_{Check Time}	_{0.213s (± 0.72%)}	_{0.212s (± 0.83%)}	_~	_0.206s	_0.220s	_{p=0.662 n=20}
_{Emit Time}	_{0.139s (± 0.95%)}	_{0.139s (± 0.74%)}	_~	_0.134s	_0.142s	_{p=0.995 n=20}
_{Total Time}	_{0.386s (± 0.45%)}	_{0.386s (± 0.48%)}	_~	_0.379s	_0.394s	_{p=0.995 n=20}
_{angular-1 - native}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_{586,506 (± 0.01%)}	_{586,542 (± 0.02%)}	_~	_585,997	_587,128	_{p=0.351 n=20}
_Types	_{241,687 (± 0.00%)}	_{241,687 (± 0.00%)}	_~	_241,683	_241,697	_{p=0.874 n=20}
_{Memory Used}	_{517,898k (± 0.01%)}	_{517,881k (± 0.02%)}	_~	_517,475k	_518,285k	_{p=0.899 n=20}
_{Memory Allocs}	_{7,805,621 (± 0.17%)}	_{7,809,035 (± 0.23%)}	_~	_7,786,434	_7,940,864	_{p=0.989 n=20}
_{Config Time}	_{0.009s (± 2.65%)}	_{0.009s (± 2.77%)}	_~	_0.009s	_0.011s	_{p=0.915 n=20}
_{Parse Time}	_{0.136s (± 4.77%)}	_{0.134s (± 2.34%)}	_~	_0.121s	_0.153s	_{p=0.732 n=20}
_{Bind Time}	_{0.051s (±11.35%)}	_{0.045s (± 7.99%)}	_~	_0.040s	_0.065s	_{p=0.383 n=20}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=1.000 n=20}
_{Emit Time}	_{0.900s (± 1.28%)}	_{0.892s (± 0.92%)}	_~	_0.856s	_0.931s	_{p=0.304 n=20}
_{Total Time}	_{1.107s (± 1.40%)}	_{1.091s (± 1.08%)}	_~	_1.049s	_1.154s	_{p=0.106 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}	_{497,284k (± 0.01%)}	_{497,308k (± 0.01%)}	_~	_497,088k	_497,569k	_{p=0.644 n=20}
_{Memory Allocs}	_{12,109,339 (± 0.01%)}	_{12,110,185 (± 0.02%)}	_~	_12,105,040	_12,119,326	_{p=0.698 n=20}
_{Config Time}	_0.001s	_{0.001s (±18.96%)}	_~	_0.001s	_0.003s	_{p=1.000 n=20}
_{Parse Time}	_{0.041s (± 2.20%)}	_{0.044s (±16.45%)}	_~	_0.036s	_0.109s	_{p=0.681 n=20}
_{Bind Time}	_{0.014s (± 9.23%)}	_{0.014s (±10.26%)}	_~	_0.011s	_0.020s	_{p=0.684 n=20}
_{Check Time}	_{0.973s (± 0.73%)}	_{0.972s (± 0.51%)}	_~	_0.953s	_0.997s	_{p=0.920 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.058s (± 0.60%)}	_{1.060s (± 1.05%)}	_~	_1.040s	_1.157s	_{p=0.952 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}	_{27,836k (± 0.02%)}	_{27,837k (± 0.02%)}	_~	_27,808k	_27,855k	_{p=0.615 n=20}
_{Memory Allocs}	_{248,639 (± 0.04%)}	_{248,696 (± 0.05%)}	_~	_248,322	_249,591	_{p=0.583 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.012s (± 3.19%)}	_{0.013s (± 2.84%)}	_~	_0.011s	_0.014s	_{p=0.312 n=20}
_{Bind Time}	_{0.004s (±11.64%)}	_{0.004s (±12.61%)}	_~	_0.003s	_0.006s	_{p=0.437 n=20}
_{Check Time}	_{0.008s (± 6.84%)}	_{0.008s (± 5.15%)}	_~	_0.007s	_0.009s	_{p=0.916 n=20}
_{Emit Time}	_{0.009s (± 6.61%)}	_{0.009s (±10.09%)}	_~	_0.007s	_0.016s	_{p=0.435 n=20}
_{Total Time}	_{0.034s (± 2.13%)}	_{0.034s (± 2.58%)}	_~	_0.032s	_0.041s	_{p=0.690 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}	_{940,502k (± 0.01%)}	_{940,459k (± 0.02%)}	_~	_939,862k	_941,181k	_{p=0.640 n=20}
_{Memory Allocs}	_{12,670,968 (± 0.02%)}	_{12,673,453 (± 0.04%)}	_~	_12,657,414	_12,706,063	_{p=0.758 n=20}
_{Config Time}	_{0.002s (± 5.09%)}	_{0.002s (± 5.09%)}	_~	_0.002s	_0.003s	_{p=1.000 n=20}
_{Parse Time}	_{0.162s (± 2.36%)}	_{0.166s (± 3.93%)}	_~	_0.148s	_0.209s	_{p=0.654 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{1.033s (± 1.81%)}	_{1.020s (± 2.04%)}	_~	_0.939s	_1.107s	_{p=0.417 n=20}
_{Emit Time}	_{0.552s (± 3.93%)}	_{0.568s (± 2.97%)}	_~	_0.513s	_0.658s	_{p=0.482 n=20}
_{Total Time}	_{1.853s (± 1.69%)}	_{1.857s (± 2.03%)}	_~	_1.734s	_2.048s	_{p=0.899 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}	_{1,836,400k (± 0.08%)}	_{1,836,261k (± 0.09%)}	_~	_1,827,820k	_1,839,989k	_{p=0.947 n=20}
_{Memory Allocs}	_{26,005,087 (± 0.13%)}	_{26,053,381 (± 0.18%)}	_~	_25,930,480	_26,374,946	_{p=0.108 n=20}
_{Config Time}	_{0.009s (± 2.82%)}	_{0.009s (± 3.06%)}	_~	_0.008s	_0.010s	_{p=0.383 n=20}
_{Parse Time}	_{0.302s (± 2.19%)}	_{0.306s (± 2.28%)}	_~	_0.275s	_0.340s	_{p=0.693 n=20}
_{Bind Time}	_{0.001s (±18.96%)}	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{3.155s (± 0.71%)}	_{3.183s (± 0.75%)}	_~	_3.089s	_3.261s	_{p=0.172 n=20}
_{Emit Time}	_{0.247s (± 1.51%)}	_{0.248s (± 1.49%)}	_~	_0.233s	_0.262s	_{p=0.773 n=20}
_{Total Time}	_{4.223s (± 0.54%)}	_{4.254s (± 0.65%)}	_~	_4.146s	_4.353s	_{p=0.092 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}	_{2,880,976k (± 0.03%)}	_{2,880,666k (± 0.02%)}	_~	_2,878,482k	_2,883,679k	_{p=0.826 n=20}
_{Memory Allocs}	_{75,334,031 (± 0.48%)}	_{75,184,658 (± 0.15%)}	_~	_74,908,961	_75,812,036	_{p=0.947 n=20}
_{Config Time}	_{0.025s (± 1.02%)}	_{0.025s (± 1.24%)}	_~	_0.024s	_0.026s	_{p=0.781 n=20}
_{Parse Time}	_{0.506s (± 5.95%)}	_{0.483s (± 4.56%)}	_~	_0.422s	_0.611s	_{p=0.317 n=20}
_{Bind Time}	_{0.160s (± 7.52%)}	_{0.190s (±11.08%)}	_{🔻+0.030s (+18.43%)}	_0.143s	_0.250s	_{p=0.020 n=20}
_{Check Time}	_{6.863s (± 0.90%)}	_{6.800s (± 0.92%)}	_~	_6.589s	_7.037s	_{p=0.134 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{7.606s (± 0.89%)}	_{7.550s (± 0.81%)}	_~	_7.353s	_7.786s	_{p=0.204 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}	_{972,516k (± 0.02%)}	_{972,544k (± 0.01%)}	_~	_972,099k	_973,295k	_{p=0.414 n=20}
_{Memory Allocs}	_{13,621,707 (± 0.36%)}	_{13,559,443 (± 0.07%)}	_~	_13,518,346	_13,606,032	_{p=0.081 n=20}
_{Config Time}	_{0.007s (± 3.00%)}	_{0.007s (± 3.17%)}	_~	_0.007s	_0.008s	_{p=0.741 n=20}
_{Parse Time}	_{0.160s (± 2.12%)}	_{0.155s (± 2.21%)}	_{-0.005s (- 3.00%)}	_0.143s	_0.174s	_{p=0.034 n=20}
_{Bind Time}	_{0.042s (± 4.09%)}	_{0.046s (±10.80%)}	_~	_0.039s	_0.075s	_{p=0.328 n=20}
_{Check Time}	_{1.506s (± 0.96%)}	_{1.500s (± 0.54%)}	_~	_1.473s	_1.541s	_{p=0.525 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.733s (± 0.89%)}	_{1.726s (± 0.64%)}	_~	_1.689s	_1.779s	_{p=0.644 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}	_{1,166,670k (± 0.43%)}	_{1,167,303k (± 0.43%)}	_~	_1,153,251k	_1,196,366k	_{p=0.799 n=20}
_{Memory Allocs}	_{47,698,293 (± 0.10%)}	_{47,668,979 (± 0.15%)}	_~	_47,454,542	_47,917,408	_{p=0.429 n=20}
_{Config Time}	_{0.002s (±15.95%)}	_{0.002s (±23.89%)}	_~	_0.001s	_0.006s	_{p=0.541 n=20}
_{Parse Time}	_{0.137s (± 1.30%)}	_{0.140s (± 1.04%)}	_~	_0.134s	_0.146s	_{p=0.052 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.805s (± 0.54%)}	_{0.806s (± 0.38%)}	_~	_0.787s	_0.816s	_{p=0.175 n=20}
_{Emit Time}	_{0.141s (± 1.39%)}	_{0.140s (± 2.53%)}	_~	_0.132s	_0.165s	_{p=0.283 n=20}
_{Total Time}	_{9.356s (± 0.52%)}	_{9.387s (± 0.30%)}	_~	_9.272s	_9.525s	_{p=0.174 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}	_{224,588k (± 0.02%)}	_{224,630k (± 0.02%)}	_~	_224,518k	_224,795k	_{p=0.355 n=20}
_{Memory Allocs}	_{2,401,316 (± 0.02%)}	_{2,401,581 (± 0.01%)}	_~	_2,400,422	_2,403,462	_{p=0.490 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.048s (± 3.21%)}	_{0.050s (± 4.08%)}	_~	_0.045s	_0.060s	_{p=0.406 n=20}
_{Bind Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Check Time}	_{0.391s (± 1.13%)}	_{0.389s (± 0.64%)}	_~	_0.379s	_0.397s	_{p=0.515 n=20}
_{Emit Time}	_{0.049s (± 5.30%)}	_{0.048s (± 5.20%)}	_~	_0.041s	_0.056s	_{p=0.631 n=20}
_{Total Time}	_{0.517s (± 0.75%)}	_{0.516s (± 0.88%)}	_~	_0.497s	_0.535s	_{p=0.952 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}	_{2,433,342k (± 0.02%)}	_{2,433,912k (± 0.02%)}	_~	_2,432,264k	_2,435,997k	_{p=0.101 n=20}
_{Memory Allocs}	_{37,388,020 (± 0.10%)}	_{37,407,381 (± 0.10%)}	_~	_37,315,855	_37,600,082	_{p=0.355 n=20}
_{Config Time}	_0.003s	_0.003s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.254s (± 2.54%)}	_{0.255s (± 2.27%)}	_~	_0.240s	_0.277s	_{p=0.634 n=20}
_{Bind Time}	_{0.091s (±12.50%)}	_{0.084s (± 6.29%)}	_~	_0.076s	_0.122s	_{p=0.180 n=20}
_{Check Time}	_{7.303s (± 0.54%)}	_{7.265s (± 0.64%)}	_~	_7.154s	_7.497s	_{p=0.144 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{7.661s (± 0.55%)}	_{7.619s (± 0.63%)}	_~	_7.501s	_7.868s	_{p=0.127 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}	_{331,457k (± 0.02%)}	_{331,428k (± 0.02%)}	_~	_331,229k	_331,648k	_{p=0.229 n=20}
_{Memory Allocs}	_{4,387,639 (± 0.10%)}	_{4,397,936 (± 0.21%)}	_~	_4,377,863	_4,439,339	_{p=0.127 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.041s (± 3.94%)}	_{0.041s (± 3.15%)}	_~	_0.038s	_0.047s	_{p=0.662 n=20}
_{Bind Time}	_{0.014s (±10.68%)}	_{0.013s (±12.80%)}	_~	_0.011s	_0.021s	_{p=0.597 n=20}
_{Check Time}	_{0.569s (± 0.89%)}	_{0.566s (± 1.25%)}	_~	_0.549s	_0.620s	_{p=0.171 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.643s (± 0.76%)}	_{0.642s (± 1.10%)}	_~	_0.621s	_0.690s	_{p=0.473 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}	_{193,526k (± 0.01%)}	_{193,541k (± 0.01%)}	_~	_193,446k	_193,648k	_{p=0.560 n=20}
_{Memory Allocs}	_{1,318,349 (± 0.02%)}	_{1,318,418 (± 0.01%)}	_~	_1,317,795	_1,318,999	_{p=0.265 n=20}
_{Config Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.044s (± 2.94%)}	_{0.044s (± 2.66%)}	_~	_0.040s	_0.047s	_{p=0.929 n=20}
_{Bind Time}	_{0.022s (± 4.73%)}	_{0.021s (± 3.42%)}	_~	_0.018s	_0.024s	_{p=0.142 n=20}
_{Check Time}	_{0.297s (± 0.91%)}	_{0.300s (± 0.88%)}	_~	_0.289s	_0.308s	_{p=0.131 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.370s (± 0.59%)}	_{0.372s (± 0.69%)}	_~	_0.357s	_0.379s	_{p=0.094 n=20}
_{vscode - native}
_Errors	₁₁	₁₁	_~	_~	_~	_{p=1.000 n=20}
_Symbols	_7,493,593	_7,493,593	_~	_~	_~	_{p=1.000 n=20}
_Types	_4,404,145	_4,404,145	_~	_~	_~	_{p=1.000 n=20}
_{Memory Used}	_{5,199,114k (± 0.02%)}	_{5,199,924k (± 0.01%)}	_~	_5,196,862k	_5,203,337k	_{p=0.091 n=20}
_{Memory Allocs}	_{56,879,542 (± 0.01%)}	_{56,883,311 (± 0.02%)}	_~	_56,864,750	_56,957,607	_{p=0.547 n=20}
_{Config Time}	_{0.036s (± 2.24%)}	_{0.036s (± 1.26%)}	_~	_0.034s	_0.038s	_{p=0.367 n=20}
_{Parse Time}	_{0.975s (± 2.75%)}	_{0.978s (± 2.94%)}	_~	_0.860s	_1.111s	_{p=0.931 n=20}
_{Bind Time}	_{0.327s (± 3.35%)}	_{0.359s (±10.36%)}	_~	_0.298s	_0.558s	_{p=0.330 n=20}
_{Check Time}	_{8.483s (± 2.00%)}	_{8.463s (± 1.78%)}	_~	_7.835s	_9.006s	_{p=0.841 n=20}
_{Emit Time}	_{2.904s (± 3.12%)}	_{2.965s (± 6.87%)}	_~	_2.645s	_4.216s	_{p=0.398 n=20}
_{Total Time}	_{12.785s (± 2.05%)}	_{12.861s (± 2.50%)}	_~	_12.029s	_14.653s	_{p=0.925 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}	_{693,544k (± 0.01%)}	_{693,422k (± 0.02%)}	_~	_693,010k	_693,956k	_{p=0.052 n=20}
_{Memory Allocs}	_{6,498,619 (± 0.03%)}	_{6,502,066 (± 0.05%)}	_~	_6,493,996	_6,518,943	_{p=0.165 n=20}
_{Config Time}	_0.004s	_0.004s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.148s (± 2.82%)}	_{0.148s (± 2.99%)}	_~	_0.133s	_0.172s	_{p=0.963 n=20}
_{Bind Time}	_{0.046s (± 6.33%)}	_{0.048s (±10.52%)}	_~	_0.038s	_0.075s	_{p=0.952 n=20}
_{Check Time}	_{1.160s (± 0.60%)}	_{1.152s (± 0.36%)}	_~	_1.133s	_1.166s	_{p=0.163 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{1.381s (± 0.61%)}	_{1.376s (± 0.55%)}	_~	_1.350s	_1.410s	_{p=0.465 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}	_{350,920k (± 0.02%)}	_{350,926k (± 0.02%)}	_~	_350,780k	_351,378k	_{p=0.482 n=20}
_{Memory Allocs}	_{3,992,063 (± 0.05%)}	_{3,991,131 (± 0.08%)}	_~	_3,980,549	_4,002,217	_{p=0.820 n=20}
_{Config Time}	_0.001s	_0.001s	_~	_~	_~	_{p=1.000 n=20}
_{Parse Time}	_{0.060s (± 2.73%)}	_{0.059s (± 1.88%)}	_~	_0.054s	_0.063s	_{p=0.414 n=20}
_{Bind Time}	_{0.021s (±11.11%)}	_{0.020s (±10.68%)}	_~	_0.017s	_0.032s	_{p=0.928 n=20}
_{Check Time}	_{0.413s (± 0.86%)}	_{0.413s (± 0.91%)}	_~	_0.400s	_0.431s	_{p=0.963 n=20}
_{Emit Time}	_0.000s	_0.000s	_~	_~	_~	_{p=1.000 n=20}
_{Total Time}	_{0.500s (± 1.06%)}	_{0.498s (± 0.89%)}	_~	_0.485s	_0.515s	_{p=0.634 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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Ryan Cavanaugh (RyanCavanaugh)

Reviewed at 159bd6a. The fast/slow split preserves map and paged-store lookup, allocation, and pointer identity behavior. Core tests and targeted compiler baselines exercising spreads, reverse-mapped properties, and parameter self references passed. No blocking issue found.

Jake Bailey (jakebailey) · 2026-10-30T19:08:50Z

Hm, seems like virtually no difference.

Copilot AI balanced review requested due to automatic review settings October 29, 2026 20:00

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

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 20:00

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Copilot AI reviewed Oct 29, 2026

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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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Split link store lookups into inlineable fast paths - #65019

Split link store lookups into inlineable fast paths#65019
Jake Bailey (jakebailey) wants to merge 1 commit into
microsoft:mainfrom
jakebailey:perf/link-store-fast-paths

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tsc

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Jake Bailey (jakebailey) commented Oct 29, 2026 •

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