Use hermes-windows 0.0.0-2604.21001-94aa5e1d

[vmoroz]

Description

Type of Change

• Dependencies (updating a dependency version)

Why

Update the Hermes engine NuGet package to pick up the latest Hermes build from the hermes-windows repo.

What

• Updated HermesVersion in vnext/PropertySheets/JSEngine.props from 0.0.0-2512.22001-bc3d0ed7 to 0.0.0-2604.21001-94aa5e1d
• Regenerated all packages.lock.json files across the repo to reflect the new package version (32 files updated)

NuGet package: https://www.nuget.org/packages/Microsoft.JavaScript.Hermes/0.0.0-2604.21001-94aa5e1d

Screenshots

N/A

Testing

• Manually tested the Playground app and using Hermes debugger.

Changelog

Should this change be included in the release notes: no

Microsoft Reviewers: Open in CodeFlow

[github-actions]

Performance Test Results

Branch: PR/use-hermes-0.0.0-2604.21001-94aa5e1d
Commit: 21ea07a6
Time: 2026-04-22T00:15:17.004Z
Tests: 161/161 passed

✅ Passed

161 scenario(s) across 28 suite(s) — no regressions

SectionList

Scenario	Mean	Median	StdDev	Renders	vs Baseline
SectionList mount	4.20ms	4.00ms	±1.03ms	1	-20.0%
SectionList unmount	0.10ms	0.00ms	±0.32ms	0	+0.0%
SectionList rerender	9.70ms	9.50ms	±1.77ms	2	-9.5%
SectionList with-3-sections-15-items	4.70ms	5.00ms	±0.67ms	1	-9.1%
SectionList with-5-sections-50-items	4.70ms	5.00ms	±0.67ms	1	-16.7%
SectionList with-10-sections-200-items	4.70ms	4.00ms	±1.25ms	1	-27.3%
SectionList with-20-sections-200-items	4.30ms	4.00ms	±1.64ms	1	-20.0%
SectionList with-section-separator	2.00ms	2.00ms	±1.49ms	1	+0.0%
SectionList with-item-separator	2.00ms	2.00ms	±0.67ms	1	+0.0%
SectionList with-header-footer	2.00ms	2.00ms	±0.47ms	1	+0.0%
SectionList with-section-footer	1.40ms	1.00ms	±0.52ms	1	-50.0%
SectionList with-sticky-section-headers	1.40ms	1.00ms	±0.52ms	1	-50.0%
SectionList with-empty-list	0.50ms	0.50ms	±0.53ms	1	-50.0%
SectionList with-50-sections-1000-items	1.40ms	1.00ms	±0.52ms	1	-50.0%

FlatList

Scenario	Mean	Median	StdDev	Renders	vs Baseline
FlatList mount	4.10ms	4.00ms	±0.57ms	1	+0.0%
FlatList unmount	0.30ms	0.00ms	±0.48ms	0	+0.0%
FlatList rerender	8.50ms	8.00ms	±1.08ms	2	-11.1%
FlatList with-10-items	4.00ms	4.00ms	±0.47ms	1	+0.0%
FlatList with-100-items	4.70ms	4.50ms	±1.16ms	1	-10.0%
FlatList with-500-items	4.30ms	4.00ms	±1.42ms	1	+0.0%
FlatList with-1000-items	3.90ms	4.00ms	±0.88ms	1	+0.0%
FlatList horizontal	3.90ms	4.00ms	±2.08ms	1	-20.0%
FlatList with-separator	1.70ms	2.00ms	±0.48ms	1	+0.0%
FlatList with-header-footer	1.40ms	1.00ms	±0.52ms	1	-50.0%
FlatList with-empty-list	0.40ms	0.00ms	±0.52ms	1	-100.0%
FlatList with-get-item-layout	1.30ms	1.00ms	±0.48ms	1	+0.0%
FlatList inverted	1.20ms	1.00ms	±0.42ms	1	-33.3%
FlatList with-num-columns	3.10ms	3.00ms	±2.18ms	1	+0.0%

TouchableOpacity

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableOpacity mount	0.70ms	1.00ms	±0.48ms	1	+0.0%
TouchableOpacity unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
TouchableOpacity rerender	0.90ms	1.00ms	±0.32ms	2	+0.0%
TouchableOpacity custom-active-opacity	0.70ms	1.00ms	±0.48ms	1	+0.0%
TouchableOpacity disabled	0.60ms	1.00ms	±0.52ms	1	+0.0%
TouchableOpacity with-all-handlers	0.50ms	0.50ms	±0.53ms	1	-50.0%
TouchableOpacity with-hit-slop	0.80ms	1.00ms	±0.42ms	1	+0.0%
TouchableOpacity with-delay	1.00ms	1.00ms	±1.15ms	1	+0.0%
TouchableOpacity nested	1.20ms	1.00ms	±0.42ms	1	+0.0%
TouchableOpacity multiple-10	4.80ms	4.00ms	±1.74ms	1	-33.3%
TouchableOpacity multiple-50	22.60ms	21.00ms	±3.31ms	1	-27.6%
TouchableOpacity multiple-100	23.00ms	20.00ms	±7.69ms	1	-60.0%

ScrollView

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ScrollView mount	0.40ms	0.00ms	±0.52ms	1	+0.0%
ScrollView unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
ScrollView rerender	0.40ms	0.00ms	±0.52ms	2	-100.0%
ScrollView children-20	3.13ms	3.00ms	±1.19ms	1	-25.0%
ScrollView children-100	14.67ms	14.00ms	±2.29ms	1	-12.5%
ScrollView horizontal	2.90ms	3.00ms	±0.32ms	1	-25.0%
ScrollView sticky-headers	2.80ms	3.00ms	±1.48ms	1	+0.0%
ScrollView scroll-indicators	0.80ms	1.00ms	±0.42ms	1	+0.0%
ScrollView nested	1.50ms	1.00ms	±0.71ms	1	+0.0%
ScrollView content-container-style	0.70ms	1.00ms	±0.48ms	1	+0.0%
ScrollView children-500	19.33ms	18.00ms	±2.50ms	1	-5.3%

TouchableHighlight

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableHighlight mount	0.40ms	0.00ms	±0.52ms	1	-100.0%
TouchableHighlight unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
TouchableHighlight rerender	0.50ms	0.50ms	±0.53ms	2	-50.0%
TouchableHighlight custom-underlay-color	0.40ms	0.00ms	±0.52ms	1	+0.0%
TouchableHighlight custom-active-opacity	0.30ms	0.00ms	±0.48ms	1	+0.0%
TouchableHighlight disabled	0.30ms	0.00ms	±0.48ms	1	+0.0%
TouchableHighlight with-all-handlers	0.30ms	0.00ms	±0.48ms	1	+0.0%
TouchableHighlight with-hit-slop	0.30ms	0.00ms	±0.48ms	1	+0.0%
TouchableHighlight nested-touchables	0.70ms	1.00ms	±0.48ms	1	+0.0%
TouchableHighlight multiple-touchables-10	2.70ms	2.00ms	±1.57ms	1	-33.3%
TouchableHighlight multiple-touchables-50	11.60ms	11.00ms	±1.35ms	1	-12.0%
TouchableHighlight multiple-touchables-100	22.00ms	21.00ms	±2.40ms	1	-6.7%

Pressable

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Pressable mount	0.50ms	0.50ms	±0.53ms	1	+Infinity%
Pressable unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Pressable rerender	0.50ms	0.50ms	±0.53ms	2	+0.0%
Pressable with-all-handlers	0.40ms	0.00ms	±0.52ms	1	+0.0%
Pressable with-style-function	0.30ms	0.00ms	±0.48ms	1	+0.0%
Pressable disabled	0.20ms	0.00ms	±0.42ms	1	+0.0%
Pressable with-hit-slop	0.40ms	0.00ms	±0.52ms	1	+0.0%
Pressable nested	0.60ms	1.00ms	±0.52ms	1	+0.0%
Pressable multiple-10	2.73ms	3.00ms	±0.46ms	1	+0.0%
Pressable multiple-50	13.80ms	13.00ms	±2.01ms	1	-7.1%
Pressable multiple-100	14.20ms	11.00ms	±7.66ms	1	-8.3%

Modal

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Modal mount	0.20ms	0.00ms	±0.42ms	1	+0.0%
Modal unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Modal rerender	0.40ms	0.00ms	±0.52ms	2	+0.0%
Modal slide-animation	0.10ms	0.00ms	±0.32ms	1	+0.0%
Modal fade-animation	0.20ms	0.00ms	±0.42ms	1	+0.0%
Modal transparent	0.20ms	0.00ms	±0.42ms	1	+0.0%
Modal with-callbacks	0.30ms	0.00ms	±0.48ms	1	+0.0%
Modal rich-content	1.20ms	1.00ms	±0.42ms	1	-50.0%
Modal with-accessibility	0.20ms	0.00ms	±0.42ms	1	+0.0%

Image

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Image mount	0.10ms	0.00ms	±0.32ms	1	+0.0%
Image unmount	0.10ms	0.00ms	±0.32ms	0	+0.0%
Image rerender	0.10ms	0.00ms	±0.32ms	2	+0.0%
Image with-resize-mode	0.10ms	0.00ms	±0.32ms	1	+0.0%
Image with-border-radius	0.20ms	0.00ms	±0.42ms	1	+0.0%
Image with-tint-color	0.10ms	0.00ms	±0.32ms	1	+0.0%
Image with-blur-radius	0.20ms	0.00ms	±0.42ms	1	+0.0%
Image with-accessibility	0.10ms	0.00ms	±0.32ms	1	+0.0%
Image multiple-10	0.80ms	1.00ms	±0.41ms	1	+0.0%
Image multiple-50	3.53ms	3.00ms	±1.13ms	1	+0.0%
Image multiple-100	7.33ms	7.00ms	±1.29ms	1	-12.5%

ActivityIndicator

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ActivityIndicator mount	0.20ms	0.00ms	±0.42ms	1	+0.0%
ActivityIndicator unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
ActivityIndicator rerender	0.30ms	0.00ms	±0.48ms	2	+0.0%
ActivityIndicator size-large	0.20ms	0.00ms	±0.42ms	1	+0.0%
ActivityIndicator size-small	0.00ms	0.00ms	±0.00ms	1	+0.0%
ActivityIndicator with-color	0.10ms	0.00ms	±0.32ms	1	+0.0%
ActivityIndicator not-animating	0.10ms	0.00ms	±0.32ms	1	+0.0%
ActivityIndicator with-accessibility	0.10ms	0.00ms	±0.32ms	1	+0.0%
ActivityIndicator multiple-10	0.73ms	1.00ms	±0.46ms	1	+0.0%
ActivityIndicator multiple-50	3.33ms	3.00ms	±1.35ms	1	-25.0%
ActivityIndicator multiple-100	7.20ms	7.00ms	±1.37ms	1	+0.0%

Switch

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Switch mount	0.30ms	0.00ms	±0.48ms	1	+0.0%
Switch unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Switch rerender	0.20ms	0.00ms	±0.42ms	2	-100.0%
Switch value-true	0.10ms	0.00ms	±0.32ms	1	+0.0%
Switch disabled	0.20ms	0.00ms	±0.42ms	1	+0.0%
Switch custom-colors	0.30ms	0.00ms	±0.48ms	1	+0.0%
Switch on-value-change	0.30ms	0.00ms	±0.48ms	1	+0.0%
Switch with-accessibility	0.30ms	0.00ms	±0.48ms	1	+0.0%
Switch multiple-10	1.20ms	1.00ms	±0.41ms	1	-50.0%
Switch multiple-50	8.60ms	7.00ms	±2.72ms	1	-22.2%
Switch multiple-100	16.13ms	15.00ms	±2.39ms	1	-6.3%

Button

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Button mount	0.50ms	0.50ms	±0.53ms	1	-50.0%
Button unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Button rerender	1.30ms	1.00ms	±1.34ms	2	+0.0%
Button disabled	0.50ms	0.50ms	±0.53ms	1	-50.0%
Button with-color	0.50ms	0.50ms	±0.53ms	1	+0.0%
Button with-accessibility	0.50ms	0.50ms	±0.53ms	1	-50.0%
Button multiple-10	5.33ms	5.00ms	±1.23ms	1	-16.7%
Button multiple-50	18.80ms	21.00ms	±7.39ms	1	-22.2%
Button multiple-100	14.00ms	13.00ms	±2.56ms	1	-31.6%

TextInput

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TextInput mount	0.20ms	0.00ms	±0.42ms	1	+0.0%
TextInput unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
TextInput rerender	0.20ms	0.00ms	±0.42ms	2	+0.0%
TextInput multiline	0.10ms	0.00ms	±0.32ms	1	+0.0%
TextInput with-value	0.20ms	0.00ms	±0.42ms	1	+0.0%
TextInput styled	0.20ms	0.00ms	±0.42ms	1	+0.0%
TextInput multiple-100	6.93ms	6.00ms	±1.44ms	1	-14.3%

View

Scenario	Mean	Median	StdDev	Renders	vs Baseline
View mount	0.10ms	0.00ms	±0.32ms	1	+0.0%
View unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
View rerender	0.10ms	0.00ms	±0.32ms	2	+0.0%
View nested-50	3.33ms	3.00ms	±1.40ms	1	+0.0%
View nested-100	6.93ms	7.00ms	±1.16ms	1	+0.0%
View shadow	0.10ms	0.00ms	±0.32ms	1	+0.0%
View border-radius	0.10ms	0.00ms	±0.32ms	1	+0.0%
View nested-500	16.53ms	10.00ms	±11.38ms	1	+0.0%

Text

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Text mount	0.20ms	0.00ms	±0.42ms	1	+0.0%
Text unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Text rerender	0.10ms	0.00ms	±0.32ms	2	+0.0%
Text long-1000	0.20ms	0.00ms	±0.42ms	1	+0.0%
Text nested	0.30ms	0.00ms	±0.48ms	1	+0.0%
Text styled	0.10ms	0.00ms	±0.32ms	1	+0.0%
Text multiple-100	7.60ms	7.00ms	±1.55ms	1	+0.0%

SectionList.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
SectionList native mount	3.73ms	3.71ms	±0.11ms	1	-43.0%

FlatList.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
FlatList native mount	3.95ms	3.62ms	±0.95ms	1	-60.8%

TouchableHighlight.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableHighlight native mount	1.28ms	1.24ms	±0.15ms	1	-40.6%

TouchableOpacity.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableOpacity native mount	1.54ms	1.42ms	±0.44ms	1	-54.6%

Pressable.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Pressable native mount	1.31ms	1.27ms	±0.13ms	1	-49.2%

ScrollView.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ScrollView native mount	2.86ms	2.63ms	±0.54ms	1	-35.0%

ActivityIndicator.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ActivityIndicator native mount	1.19ms	1.11ms	±0.21ms	1	-55.5%

TextInput.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TextInput native mount	1.86ms	1.80ms	±0.16ms	1	-55.9%

Switch.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Switch native mount	0.99ms	0.99ms	±0.04ms	1	-42.8%

Button.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Button native mount	1.57ms	1.51ms	±0.14ms	1	-41.9%

Modal.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Modal native mount	1.03ms	0.81ms	±0.57ms	1	-33.8%

Image.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Image native mount	1.52ms	1.48ms	±0.14ms	1	-34.6%

View.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
View native mount	0.97ms	0.93ms	±0.16ms	1	-35.2%

Text.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Text native mount	1.45ms	1.30ms	±0.54ms	1	-25.5%