perf: cache NativeState→HybridObject dynamic_cast offset per type in HybridFunc.

[riteshshukla04]

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated
nitro-docs	Skipped		Sep 5, 2026 1:25pm UTC

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Performance Report

⚠️ Advisory: Results do not fail this PR while the baseline is being calibrated.

iOS

Benchmark	Before	After	Difference
C++ large array (1,024)	62.33 µs	68.78 µs	🔴 +10.35% slower
C++ optional trailing string	228.3 ns	194.9 ns	🟢 -14.6% faster
C++ simpleFunc()	113.1 ns	85.0 ns	🟢 -24.81% faster
C++ number property get/set	211.7 ns	153.6 ns	🟢 -27.45% faster
Swift copy(1 MiB)	91.30 µs	116.69 µs	🔴 +27.82% slower
Swift addNumbers()	134.5 ns	100.4 ns	🟢 -25.35% faster
Swift simpleFunc()	108.2 ns	79.7 ns	🟢 -26.35% faster
Swift number property get/set	248.3 ns	195.7 ns	🟢 -21.19% faster
Swift nested Car struct	3.15 µs	3.64 µs	🔴 +15.37% slower

All Benchmarks

Benchmark	Before	After	Difference
JavaScript addNumbers()	37.2 ns	35.3 ns	🟡 -5.1% faster (noisy)
C++ bounce(1 MiB)	386.6 ns	408.6 ns	🟡 +5.68% slower (noisy)
C++ bounce(4 KiB)	389.7 ns	409.3 ns	🟡 +5.04% slower (noisy)
C++ copy(1 MiB)	94.74 µs	104.21 µs	🟡 +9.99% slower (noisy)
C++ copy(4 KiB)	1.25 µs	1.67 µs	🟡 +33.83% slower (noisy)
C++ small array (16)	1.24 µs	1.32 µs	🟡 +6.38% slower (noisy)
C++ synchronousCallback()	311.2 ns	326.7 ns	🟡 +5% slower (noisy)
C++ create()	615.1 ns	562.0 ns	🟡 -8.63% faster (noisy)
C++ returnExisting()	298.8 ns	278.0 ns	🟡 -6.96% faster (noisy)
C++ typed map (8 entries)	2.69 µs	2.44 µs	🟡 -9.24% faster (noisy)
C++ addNumbers()	128.8 ns	114.7 ns	🟡 -10.9% faster (noisy)
C++ immediatePromise()	1.28 µs	1.29 µs	ℹ️ +0.72% slower (advisory)
C++ short ASCII string	213.6 ns	200.8 ns	🟡 -6% faster (noisy)
C++ Unicode string	484.6 ns	454.3 ns	🟡 -6.25% faster (noisy)
C++ nested Car struct	3.20 µs	3.23 µs	🟡 +1.11% slower (noisy)
C++ number | string variant	200.3 ns	184.7 ns	🟡 -7.75% faster (noisy)
Swift bounce(1 MiB)	463.2 ns	432.5 ns	🟡 -6.64% faster (noisy)
Swift bounce(4 KiB)	482.2 ns	414.3 ns	🟡 -14.07% faster (noisy)
Swift copy(4 KiB)	1.81 µs	1.67 µs	🟡 -7.76% faster (noisy)
Swift large array (1,024)	64.94 µs	68.80 µs	🟡 +5.94% slower (noisy)
Swift small array (16)	1.35 µs	1.45 µs	🟡 +7.33% slower (noisy)
Swift synchronousCallback()	447.8 ns	427.8 ns	🟡 -4.47% faster (noisy)
Swift create()	34.28 µs	42.67 µs	🟡 +24.49% slower (noisy)
Swift returnExisting()	379.8 ns	351.5 ns	🟡 -7.44% faster (noisy)
Swift typed map (8 entries)	3.38 µs	3.57 µs	🟡 +5.75% slower (noisy)
Swift optional trailing string	252.3 ns	236.0 ns	🟡 -6.46% faster (noisy)
Swift immediatePromise()	2.22 µs	2.56 µs	ℹ️ +15.41% slower (advisory)
Swift short ASCII string	280.6 ns	240.7 ns	🟡 -14.24% faster (noisy)
Swift Unicode string	560.3 ns	576.1 ns	🟡 +2.81% slower (noisy)
Swift number | string variant	330.1 ns	290.6 ns	🟡 -11.96% faster (noisy)
TurboModule addNumbers()	1.46 µs	1.41 µs	🟡 -2.89% faster (noisy)

Android

Benchmark	Before	After	Difference
C++ bounce(1 MiB)	641.9 ns	588.8 ns	🟢 -8.26% faster
C++ copy(4 KiB)	1.55 µs	1.46 µs	🟢 -5.49% faster
C++ create()	1.05 µs	974.2 ns	🟢 -7.48% faster
C++ returnExisting()	396.0 ns	355.6 ns	🟢 -10.21% faster
C++ addNumbers()	173.6 ns	151.8 ns	🟢 -12.55% faster
C++ simpleFunc()	142.9 ns	125.5 ns	🟢 -12.19% faster
C++ number property get/set	299.7 ns	254.0 ns	🟢 -15.25% faster
C++ short ASCII string	259.8 ns	232.7 ns	🟢 -10.43% faster
C++ Unicode string	519.0 ns	476.2 ns	🟢 -8.25% faster
C++ number | string variant	253.3 ns	228.5 ns	🟢 -9.81% faster
Kotlin returnExisting()	1.22 µs	1.13 µs	🟢 -7.73% faster
Kotlin optional trailing string	699.7 ns	642.5 ns	🟢 -8.18% faster
Kotlin addNumbers()	240.4 ns	205.8 ns	🟢 -14.41% faster
Kotlin simpleFunc()	212.1 ns	161.0 ns	🟢 -24.09% faster
Kotlin number property get/set	520.5 ns	424.3 ns	🟢 -18.48% faster
Kotlin short ASCII string	963.4 ns	860.7 ns	🟢 -10.66% faster
Kotlin Unicode string	1.52 µs	1.41 µs	🟢 -7.23% faster
Kotlin number | string variant	883.6 ns	777.9 ns	🟢 -11.96% faster

All Benchmarks

Benchmark	Before	After	Difference
JavaScript addNumbers()	47.1 ns	46.8 ns	⚪ ~0.55% unchanged
C++ bounce(4 KiB)	644.5 ns	616.5 ns	🟡 -4.34% faster (noisy)
C++ copy(1 MiB)	33.64 µs	33.19 µs	⚪ ~1.35% unchanged
C++ large array (1,024)	81.05 µs	80.43 µs	⚪ ~0.76% unchanged
C++ small array (16)	1.61 µs	1.58 µs	⚪ ~2.09% unchanged
C++ synchronousCallback()	512.3 ns	498.2 ns	🟡 -2.74% faster (noisy)
C++ typed map (8 entries)	3.17 µs	3.18 µs	⚪ ~0.37% unchanged
C++ optional trailing string	268.7 ns	259.7 ns	⚪ ~3.37% unchanged
C++ immediatePromise()	1.76 µs	1.72 µs	ℹ️ -2.52% faster (advisory)
C++ nested Car struct	4.39 µs	4.26 µs	⚪ ~2.83% unchanged
Kotlin bounce(1 MiB)	1.91 µs	1.83 µs	🟡 -3.78% faster (noisy)
Kotlin bounce(4 KiB)	1.88 µs	1.87 µs	🟡 -0.68% faster (noisy)
Kotlin copy(1 MiB)	494.32 µs	501.35 µs	⚪ ~1.42% unchanged
Kotlin copy(4 KiB)	8.48 µs	8.64 µs	🟡 +1.95% slower (noisy)
Kotlin large array (1,024)	90.22 µs	89.54 µs	⚪ ~0.76% unchanged
Kotlin small array (16)	2.25 µs	2.14 µs	⚪ ~4.56% unchanged
Kotlin synchronousCallback()	1.79 µs	1.74 µs	⚪ ~2.78% unchanged
Kotlin create()	3.25 µs	3.15 µs	⚪ ~3.37% unchanged
Kotlin typed map (8 entries)	13.32 µs	13.18 µs	⚪ ~1.04% unchanged
Kotlin immediatePromise()	5.02 µs	4.96 µs	ℹ️ -1.31% faster (advisory)
Kotlin nested Car struct	9.27 µs	9.13 µs	⚪ ~1.52% unchanged
TurboModule addNumbers()	470.3 ns	473.9 ns	⚪ ~0.76% unchanged

Benchmarking Code Diff fe50d8fc...3083c6b5 (view raw output)