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Signed-off-by: Robert Kruszewski github@robertk.io

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codspeed-hq bot commented Jan 30, 2026

CodSpeed Performance Report

Merging this PR will degrade performance by 32.37%

Comparing rk/fixedsizedlisttake (4ab43a1) with develop (26fa799)1

Summary

⚡ 20 improved benchmarks
❌ 1 regressed benchmark
✅ 1117 untouched benchmarks
⏩ 1384 skipped benchmarks2

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
Simulation chunked_bool_into_canonical[(1000, 10)] 43.1 µs 63.7 µs -32.37%
Simulation take_fsl_nullable_random[1024, 100] 3.1 ms 2 ms +54.43%
Simulation take_fsl_nullable_random[256, 100] 796.3 µs 525.5 µs +51.54%
Simulation take_fsl_nullable_random[1024, 1000] 32.6 ms 22.6 ms +44.58%
Simulation take_fsl_nullable_random[16, 1000] 533.6 µs 399.2 µs +33.66%
Simulation take_fsl_nullable_random[64, 1000] 1.9 ms 1.3 ms +47.87%
Simulation take_fsl_nullable_random[64, 100] 233.6 µs 165.5 µs +41.13%
Simulation take_fsl_random[16, 1000] 516.1 µs 366.5 µs +40.81%
Simulation take_fsl_nullable_random[4096, 1000] 131 ms 90.8 ms +44.32%
Simulation take_fsl_random[1024, 1000] 34.4 ms 23 ms +49.44%
Simulation take_fsl_nullable_random[16, 100] 140.7 µs 123.6 µs +13.83%
Simulation take_fsl_nullable_random[256, 1000] 7.2 ms 4.7 ms +53.19%
Simulation take_fsl_random[1024, 100] 3.1 ms 2 ms +57.14%
Simulation take_fsl_random[4096, 1000] 138.2 ms 92.7 ms +49.1%
Simulation take_fsl_nullable_random[4096, 100] 12.4 ms 8.1 ms +53.39%
Simulation take_fsl_random[256, 100] 804.6 µs 519.7 µs +54.82%
Simulation take_fsl_random[16, 100] 75 µs 59.7 µs +25.61%
Simulation take_fsl_random[4096, 100] 12.7 ms 8.2 ms +55.62%
Simulation take_fsl_random[256, 1000] 7.8 ms 4.9 ms +57.72%
Simulation take_fsl_random[64, 1000] 2 ms 1.3 ms +53.46%
... ... ... ... ... ...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.

Footnotes

  1. No successful run was found on develop (2f9b92c) during the generation of this report, so 26fa799 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report.

  2. 1384 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports.

@robert3005 robert3005 added the changelog/performance A performance improvement label Jan 30, 2026
@robert3005 robert3005 force-pushed the rk/fixedsizedlisttake branch from bc628a1 to 48842d4 Compare January 30, 2026 16:56
…e in fixedsizedlist take

Signed-off-by: Robert Kruszewski <github@robertk.io>
@robert3005 robert3005 force-pushed the rk/fixedsizedlisttake branch from 48842d4 to 49f5351 Compare January 30, 2026 19:37
@connortsui20
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This is nice! I'm now convinced that if we migrated all of our builders to vectors we would have huge perf improvements everywhere since it makes these kinds of optimizations so much easier.

Signed-off-by: Robert Kruszewski <github@robertk.io>
@robert3005 robert3005 enabled auto-merge (squash) February 2, 2026 02:40
@robert3005 robert3005 requested a review from gatesn February 2, 2026 02:49
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