Use hermes-windows 0.0.0-2604.6001-5335deff

[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 0.0.0-2604.6001-5335deff
• 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/0.0.0-2604.6001-5335deff

Screenshots

N/A

Testing

• Built vnext/ReactWindows-Desktop.sln (Debug|x64) successfully — all native projects compiled with no errors related to the Hermes update.

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-0.0.0-2604.6001-5335deff
Commit: bfb942e9
Time: 2026-04-20T17:32:57.719Z
Tests: 161/161 passed

✅ Passed

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

SectionList

Scenario	Mean	Median	StdDev	Renders	vs Baseline
SectionList mount	5.10ms	5.00ms	±0.74ms	1	+0.0%
SectionList unmount	0.10ms	0.00ms	±0.32ms	0	+0.0%
SectionList rerender	11.40ms	11.00ms	±2.46ms	2	+4.8%
SectionList with-3-sections-15-items	5.20ms	5.00ms	±1.03ms	1	-9.1%
SectionList with-5-sections-50-items	5.30ms	5.00ms	±0.67ms	1	-16.7%
SectionList with-10-sections-200-items	5.60ms	5.00ms	±0.97ms	1	-9.1%
SectionList with-20-sections-200-items	4.90ms	5.00ms	±1.29ms	1	+0.0%
SectionList with-section-separator	2.20ms	2.00ms	±1.40ms	1	+0.0%
SectionList with-item-separator	2.40ms	2.00ms	±0.52ms	1	+0.0%
SectionList with-header-footer	2.10ms	2.00ms	±0.57ms	1	+0.0%
SectionList with-section-footer	1.40ms	1.00ms	±0.52ms	1	-50.0%
SectionList with-sticky-section-headers	1.80ms	2.00ms	±0.92ms	1	+0.0%
SectionList with-empty-list	0.40ms	0.00ms	±0.52ms	1	-100.0%
SectionList with-50-sections-1000-items	2.20ms	2.00ms	±1.40ms	1	+0.0%

FlatList

Scenario	Mean	Median	StdDev	Renders	vs Baseline
FlatList mount	4.90ms	4.50ms	±1.52ms	1	+12.5%
FlatList unmount	0.30ms	0.00ms	±0.48ms	0	+0.0%
FlatList rerender	10.80ms	10.00ms	±2.30ms	2	+11.1%
FlatList with-10-items	5.10ms	5.00ms	±1.10ms	1	+25.0%
FlatList with-100-items	4.50ms	4.50ms	±0.53ms	1	-10.0%
FlatList with-500-items	4.60ms	5.00ms	±0.84ms	1	+25.0%
FlatList with-1000-items	4.40ms	4.00ms	±0.52ms	1	+0.0%
FlatList horizontal	4.50ms	4.00ms	±1.78ms	1	-20.0%
FlatList with-separator	1.70ms	2.00ms	±0.67ms	1	+0.0%
FlatList with-header-footer	1.40ms	1.00ms	±0.52ms	1	-50.0%
FlatList with-empty-list	0.50ms	0.50ms	±0.53ms	1	+0.0%
FlatList with-get-item-layout	1.60ms	1.00ms	±0.97ms	1	+0.0%
FlatList inverted	1.40ms	1.00ms	±0.52ms	1	-33.3%
FlatList with-num-columns	3.40ms	3.00ms	±1.65ms	1	+0.0%

TouchableOpacity

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableOpacity mount	0.60ms	1.00ms	±0.52ms	1	+0.0%
TouchableOpacity unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
TouchableOpacity rerender	1.00ms	1.00ms	±0.47ms	2	+0.0%
TouchableOpacity custom-active-opacity	0.60ms	1.00ms	±0.52ms	1	+0.0%
TouchableOpacity disabled	0.30ms	0.00ms	±0.48ms	1	-100.0%
TouchableOpacity with-all-handlers	0.60ms	1.00ms	±0.52ms	1	+0.0%
TouchableOpacity with-hit-slop	0.80ms	1.00ms	±0.42ms	1	+0.0%
TouchableOpacity with-delay	0.60ms	1.00ms	±0.52ms	1	+0.0%
TouchableOpacity nested	1.50ms	1.00ms	±0.71ms	1	+0.0%
TouchableOpacity multiple-10	5.60ms	5.00ms	±1.40ms	1	-16.7%
TouchableOpacity multiple-50	25.80ms	25.00ms	±2.93ms	1	-13.8%
TouchableOpacity multiple-100	41.00ms	45.00ms	±13.01ms	1	-10.0%

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	0.60ms	1.00ms	±0.52ms	2	+0.0%
ScrollView children-20	3.53ms	3.00ms	±1.30ms	1	-25.0%
ScrollView children-100	16.73ms	16.00ms	±2.15ms	1	+0.0%
ScrollView horizontal	3.20ms	3.00ms	±0.63ms	1	-25.0%
ScrollView sticky-headers	3.20ms	3.00ms	±1.48ms	1	+0.0%
ScrollView scroll-indicators	0.70ms	1.00ms	±0.48ms	1	+0.0%
ScrollView nested	1.30ms	1.00ms	±0.48ms	1	+0.0%
ScrollView content-container-style	0.80ms	1.00ms	±0.42ms	1	+0.0%
ScrollView children-500	20.20ms	19.00ms	±2.96ms	1	+0.0%

TouchableHighlight

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableHighlight mount	0.70ms	1.00ms	±0.48ms	1	+100.0%
TouchableHighlight unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
TouchableHighlight rerender	0.70ms	1.00ms	±0.48ms	2	+0.0%
TouchableHighlight custom-underlay-color	0.40ms	0.00ms	±0.52ms	1	+0.0%
TouchableHighlight custom-active-opacity	0.40ms	0.00ms	±0.52ms	1	+0.0%
TouchableHighlight disabled	0.30ms	0.00ms	±0.48ms	1	+0.0%
TouchableHighlight with-all-handlers	0.20ms	0.00ms	±0.42ms	1	+0.0%
TouchableHighlight with-hit-slop	0.50ms	0.50ms	±0.53ms	1	+Infinity%
TouchableHighlight nested-touchables	1.00ms	1.00ms	±0.47ms	1	+0.0%
TouchableHighlight multiple-touchables-10	2.80ms	2.50ms	±1.23ms	1	-16.7%
TouchableHighlight multiple-touchables-50	13.50ms	13.00ms	±1.72ms	1	+4.0%
TouchableHighlight multiple-touchables-100	24.70ms	24.50ms	±4.06ms	1	+8.9%

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	0.60ms	1.00ms	±0.52ms	2	+100.0%
Pressable with-all-handlers	0.60ms	1.00ms	±0.52ms	1	+Infinity%
Pressable with-style-function	0.30ms	0.00ms	±0.48ms	1	+0.0%
Pressable disabled	0.30ms	0.00ms	±0.48ms	1	+0.0%
Pressable with-hit-slop	0.40ms	0.00ms	±0.52ms	1	+0.0%
Pressable nested	0.50ms	0.50ms	±0.53ms	1	-50.0%
Pressable multiple-10	3.07ms	3.00ms	±0.26ms	1	+0.0%
Pressable multiple-50	16.40ms	16.00ms	±2.32ms	1	+14.3%
Pressable multiple-100	16.53ms	12.00ms	±10.01ms	1	+0.0%

Modal

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Modal mount	0.40ms	0.00ms	±0.52ms	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	0.30ms	0.00ms	±0.48ms	1	+0.0%
Modal fade-animation	0.20ms	0.00ms	±0.42ms	1	+0.0%
Modal transparent	0.30ms	0.00ms	±0.48ms	1	+0.0%
Modal with-callbacks	0.10ms	0.00ms	±0.32ms	1	+0.0%
Modal rich-content	1.60ms	1.50ms	±0.70ms	1	-25.0%
Modal with-accessibility	0.20ms	0.00ms	±0.42ms	1	+0.0%

Image

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Image mount	0.40ms	0.00ms	±0.97ms	1	+0.0%
Image unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Image rerender	0.20ms	0.00ms	±0.42ms	2	+0.0%
Image with-resize-mode	0.20ms	0.00ms	±0.42ms	1	+0.0%
Image with-border-radius	0.10ms	0.00ms	±0.32ms	1	+0.0%
Image with-tint-color	0.20ms	0.00ms	±0.42ms	1	+0.0%
Image with-blur-radius	0.10ms	0.00ms	±0.32ms	1	+0.0%
Image with-accessibility	0.10ms	0.00ms	±0.32ms	1	+0.0%
Image multiple-10	1.00ms	1.00ms	±0.00ms	1	+0.0%
Image multiple-50	4.00ms	4.00ms	±1.20ms	1	+33.3%
Image multiple-100	8.40ms	8.00ms	±1.30ms	1	+0.0%

ActivityIndicator

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ActivityIndicator mount	0.00ms	0.00ms	±0.00ms	1	+0.0%
ActivityIndicator unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
ActivityIndicator rerender	0.10ms	0.00ms	±0.32ms	2	+0.0%
ActivityIndicator size-large	0.20ms	0.00ms	±0.42ms	1	+0.0%
ActivityIndicator size-small	0.10ms	0.00ms	±0.32ms	1	+0.0%
ActivityIndicator with-color	0.20ms	0.00ms	±0.42ms	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	0.87ms	1.00ms	±0.35ms	1	+0.0%
ActivityIndicator multiple-50	3.73ms	3.00ms	±1.10ms	1	-25.0%
ActivityIndicator multiple-100	8.00ms	8.00ms	±0.85ms	1	+14.3%

Switch

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Switch mount	0.20ms	0.00ms	±0.42ms	1	+0.0%
Switch unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Switch rerender	0.40ms	0.00ms	±0.52ms	2	-100.0%
Switch value-true	0.20ms	0.00ms	±0.42ms	1	+0.0%
Switch disabled	0.30ms	0.00ms	±0.48ms	1	+0.0%
Switch custom-colors	0.30ms	0.00ms	±0.48ms	1	+0.0%
Switch on-value-change	0.20ms	0.00ms	±0.42ms	1	+0.0%
Switch with-accessibility	0.20ms	0.00ms	±0.42ms	1	+0.0%
Switch multiple-10	1.60ms	2.00ms	±0.51ms	1	+0.0%
Switch multiple-50	9.40ms	8.00ms	±2.61ms	1	-11.1%
Switch multiple-100	18.13ms	17.00ms	±2.72ms	1	+6.3%

Button

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Button mount	0.60ms	1.00ms	±0.52ms	1	+0.0%
Button unmount	0.10ms	0.00ms	±0.32ms	0	+0.0%
Button rerender	1.50ms	1.00ms	±1.35ms	2	+0.0%
Button disabled	0.50ms	0.50ms	±0.53ms	1	-50.0%
Button with-color	0.60ms	1.00ms	±0.52ms	1	+100.0%
Button with-accessibility	0.60ms	1.00ms	±0.52ms	1	+0.0%
Button multiple-10	5.67ms	5.00ms	±1.40ms	1	-16.7%
Button multiple-50	21.27ms	26.00ms	±8.10ms	1	-3.7%
Button multiple-100	25.20ms	18.00ms	±22.94ms	1	-5.3%

TextInput

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TextInput mount	0.30ms	0.00ms	±0.48ms	1	+0.0%
TextInput unmount	0.10ms	0.00ms	±0.32ms	0	+0.0%
TextInput rerender	0.10ms	0.00ms	±0.32ms	2	+0.0%
TextInput multiline	0.10ms	0.00ms	±0.32ms	1	+0.0%
TextInput with-value	0.10ms	0.00ms	±0.32ms	1	+0.0%
TextInput styled	0.00ms	0.00ms	±0.00ms	1	+0.0%
TextInput multiple-100	7.73ms	7.00ms	±0.96ms	1	+0.0%

View

Scenario	Mean	Median	StdDev	Renders	vs Baseline
View mount	0.20ms	0.00ms	±0.42ms	1	+0.0%
View unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
View rerender	0.20ms	0.00ms	±0.42ms	2	+0.0%
View nested-50	3.47ms	3.00ms	±0.52ms	1	+0.0%
View nested-100	8.53ms	8.00ms	±2.20ms	1	+14.3%
View shadow	0.20ms	0.00ms	±0.42ms	1	+0.0%
View border-radius	0.20ms	0.00ms	±0.42ms	1	+0.0%
View nested-500	16.73ms	10.00ms	±13.01ms	1	+0.0%

Text

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Text mount	0.20ms	0.00ms	±0.42ms	1	+0.0%
Text unmount	0.10ms	0.00ms	±0.32ms	0	+0.0%
Text rerender	0.20ms	0.00ms	±0.42ms	2	+0.0%
Text long-1000	0.10ms	0.00ms	±0.32ms	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	8.80ms	9.00ms	±1.61ms	1	+28.6%

SectionList.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
SectionList native mount	5.27ms	5.19ms	±0.76ms	1	-20.2%

FlatList.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
FlatList native mount	4.99ms	4.87ms	±0.52ms	1	-47.3%

TouchableHighlight.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableHighlight native mount	1.55ms	1.48ms	±0.19ms	1	-29.1%

TouchableOpacity.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableOpacity native mount	1.79ms	1.75ms	±0.23ms	1	-44.3%

Pressable.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Pressable native mount	1.62ms	1.53ms	±0.24ms	1	-39.2%

ScrollView.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ScrollView native mount	2.88ms	2.79ms	±0.20ms	1	-31.0%

ActivityIndicator.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ActivityIndicator native mount	1.13ms	1.12ms	±0.05ms	1	-54.8%

TextInput.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TextInput native mount	1.82ms	1.78ms	±0.13ms	1	-56.4%

Switch.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Switch native mount	1.29ms	1.23ms	±0.30ms	1	-29.3%

Button.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Button native mount	2.01ms	1.93ms	±0.30ms	1	-25.6%

Modal.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Modal native mount	1.02ms	0.99ms	±0.17ms	1	-19.1%

Image.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Image native mount	1.76ms	1.68ms	±0.24ms	1	-25.5%

View.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
View native mount	1.09ms	1.05ms	±0.10ms	1	-26.3%

Text.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Text native mount	1.19ms	1.14ms	±0.17ms	1	-34.5%