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Remove CORE_ABI and bring rnwin32 and MS.RN much closer in functionality#16079

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nomorecoreabi
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Remove CORE_ABI and bring rnwin32 and MS.RN much closer in functionality#16079
acoates-ms wants to merge 8 commits intomainfrom
nomorecoreabi

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@acoates-ms acoates-ms commented May 1, 2026 •
edited by microsoft-github-policy-service Bot
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Description

Remove CORE_ABI #define to better align rnwin32.dll and MS.RN.dll.
Bring several default modules into rnwin32.dll.
Remove some more unneeded code from paper.

Microsoft Reviewers: Open in CodeFlow

@acoates-ms acoates-ms requested review from a team as code owners May 1, 2026 00:52
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Performance Test Results

Branch: nomorecoreabi
Commit: 030df1d7
Time: 2026-05-01T20:05:02.581Z
Tests: 161/161 passed

✅ Passed

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

SectionList

Scenario Mean Median StdDev Renders vs Baseline
SectionList mount 4.90ms 5.00ms ±0.88ms 1 +0.0%
SectionList unmount 0.20ms 0.00ms ±0.42ms 0 +0.0%
SectionList rerender 14.10ms 13.50ms ±3.70ms 2 +28.6%
SectionList with-3-sections-15-items 7.10ms 7.50ms ±1.79ms 1 +36.4%
SectionList with-5-sections-50-items 6.00ms 6.00ms ±1.05ms 1 +0.0%
SectionList with-10-sections-200-items 7.90ms 8.00ms ±2.42ms 1 +45.5%
SectionList with-20-sections-200-items 5.90ms 5.50ms ±2.47ms 1 +10.0%
SectionList with-section-separator 2.90ms 2.50ms ±2.28ms 1 +25.0%
SectionList with-item-separator 3.10ms 3.00ms ±1.10ms 1 +50.0%
SectionList with-header-footer 2.00ms 2.00ms ±0.67ms 1 +0.0%
SectionList with-section-footer 2.70ms 3.00ms ±0.67ms 1 +50.0%
SectionList with-sticky-section-headers 2.30ms 2.00ms ±1.25ms 1 +0.0%
SectionList with-empty-list 0.50ms 0.50ms ±0.53ms 1 -50.0%
SectionList with-50-sections-1000-items 1.90ms 2.00ms ±0.32ms 1 +0.0%

FlatList

Scenario Mean Median StdDev Renders vs Baseline
FlatList mount 4.40ms 4.00ms ±0.52ms 1 +0.0%
FlatList unmount 0.10ms 0.00ms ±0.32ms 0 +0.0%
FlatList rerender 11.60ms 11.00ms ±1.43ms 2 +22.2%
FlatList with-10-items 6.00ms 5.00ms ±2.26ms 1 +25.0%
FlatList with-100-items 6.00ms 5.50ms ±1.63ms 1 +10.0%
FlatList with-500-items 5.00ms 5.00ms ±1.49ms 1 +25.0%
FlatList with-1000-items 4.40ms 4.50ms ±0.70ms 1 +12.5%
FlatList horizontal 4.90ms 5.00ms ±2.18ms 1 +0.0%
FlatList with-separator 2.50ms 2.00ms ±0.71ms 1 +0.0%
FlatList with-header-footer 1.80ms 2.00ms ±0.42ms 1 +0.0%
FlatList with-empty-list 0.30ms 0.00ms ±0.48ms 1 -100.0%
FlatList with-get-item-layout 1.70ms 2.00ms ±0.48ms 1 +100.0%
FlatList inverted 2.10ms 2.00ms ±0.88ms 1 +33.3%
FlatList with-num-columns 3.20ms 3.00ms ±2.53ms 1 +0.0%

TouchableOpacity

Scenario Mean Median StdDev Renders vs Baseline
TouchableOpacity mount 1.00ms 1.00ms ±0.00ms 1 +0.0%
TouchableOpacity unmount 0.10ms 0.00ms ±0.32ms 0 +0.0%
TouchableOpacity rerender 1.40ms 1.50ms ±0.70ms 2 +50.0%
TouchableOpacity custom-active-opacity 0.80ms 1.00ms ±0.42ms 1 +0.0%
TouchableOpacity disabled 0.50ms 0.50ms ±0.53ms 1 -50.0%
TouchableOpacity with-all-handlers 0.80ms 1.00ms ±0.42ms 1 +0.0%
TouchableOpacity with-hit-slop 0.70ms 1.00ms ±0.48ms 1 +0.0%
TouchableOpacity with-delay 0.40ms 0.00ms ±0.52ms 1 -100.0%
TouchableOpacity nested 1.50ms 1.00ms ±0.71ms 1 +0.0%
TouchableOpacity multiple-10 7.13ms 7.00ms ±1.92ms 1 +16.7%
TouchableOpacity multiple-50 32.53ms 29.00ms ±8.48ms 1 +0.0%
TouchableOpacity multiple-100 50.00ms 51.00ms ±12.29ms 1 +2.0%

ScrollView

Scenario Mean Median StdDev Renders vs Baseline
ScrollView mount 0.30ms 0.00ms ±0.48ms 1 +0.0%
ScrollView unmount 0.00ms 0.00ms ±0.00ms 0 +0.0%
ScrollView rerender 0.70ms 1.00ms ±0.48ms 2 +0.0%
ScrollView children-20 3.87ms 4.00ms ±0.74ms 1 +0.0%
ScrollView children-100 18.53ms 17.00ms ±4.24ms 1 +6.3%
ScrollView horizontal 3.50ms 4.00ms ±0.71ms 1 +0.0%
ScrollView sticky-headers 2.90ms 3.00ms ±0.88ms 1 +0.0%
ScrollView scroll-indicators 1.20ms 1.00ms ±1.40ms 1 +0.0%
ScrollView nested 1.70ms 2.00ms ±0.67ms 1 +100.0%
ScrollView content-container-style 0.90ms 1.00ms ±0.32ms 1 +0.0%
ScrollView children-500 21.47ms 21.00ms ±4.07ms 1 +10.5%

TouchableHighlight

Scenario Mean Median StdDev Renders vs Baseline
TouchableHighlight mount 0.60ms 1.00ms ±0.52ms 1 +100.0%
TouchableHighlight unmount 0.00ms 0.00ms ±0.00ms 0 +0.0%
TouchableHighlight rerender 0.60ms 1.00ms ±0.52ms 2 +0.0%
TouchableHighlight custom-underlay-color 0.60ms 1.00ms ±0.52ms 1 +Infinity%
TouchableHighlight custom-active-opacity 0.30ms 0.00ms ±0.48ms 1 +0.0%
TouchableHighlight disabled 0.40ms 0.00ms ±0.52ms 1 +0.0%
TouchableHighlight with-all-handlers 0.40ms 0.00ms ±0.52ms 1 +0.0%
TouchableHighlight with-hit-slop 0.70ms 0.00ms ±1.57ms 1 +0.0%
TouchableHighlight nested-touchables 1.00ms 1.00ms ±0.00ms 1 +0.0%
TouchableHighlight multiple-touchables-10 3.20ms 3.00ms ±0.92ms 1 +0.0%
TouchableHighlight multiple-touchables-50 15.10ms 15.00ms ±2.64ms 1 +20.0%
TouchableHighlight multiple-touchables-100 27.90ms 27.50ms ±6.33ms 1 +22.2%

Pressable

Scenario Mean Median StdDev Renders vs Baseline
Pressable mount 0.40ms 0.00ms ±0.52ms 1 +0.0%
Pressable unmount 0.00ms 0.00ms ±0.00ms 0 +0.0%
Pressable rerender 0.70ms 1.00ms ±0.48ms 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 0.30ms 0.00ms ±0.48ms 1 +0.0%
Pressable nested 0.80ms 1.00ms ±0.42ms 1 +0.0%
Pressable multiple-10 3.60ms 3.00ms ±1.68ms 1 +0.0%
Pressable multiple-50 18.13ms 18.00ms ±2.95ms 1 +28.6%
Pressable multiple-100 21.27ms 19.00ms ±12.16ms 1 +58.3%

Modal

Scenario Mean Median StdDev Renders vs Baseline
Modal mount 0.40ms 0.00ms ±0.52ms 1 +0.0%
Modal unmount 0.10ms 0.00ms ±0.32ms 0 +0.0%
Modal rerender 0.60ms 1.00ms ±0.52ms 2 +Infinity%
Modal slide-animation 0.40ms 0.00ms ±0.52ms 1 +0.0%
Modal fade-animation 0.10ms 0.00ms ±0.32ms 1 +0.0%
Modal transparent 0.40ms 0.00ms ±0.52ms 1 +0.0%
Modal with-callbacks 0.30ms 0.00ms ±0.48ms 1 +0.0%
Modal rich-content 1.40ms 1.00ms ±0.52ms 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 0.20ms 0.00ms ±0.42ms 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 0.00ms 0.00ms ±0.00ms 1 +0.0%
Image with-border-radius 0.20ms 0.00ms ±0.42ms 1 +0.0%
Image with-tint-color 0.20ms 0.00ms ±0.42ms 1 +0.0%
Image with-blur-radius 0.00ms 0.00ms ±0.00ms 1 +0.0%
Image with-accessibility 0.20ms 0.00ms ±0.42ms 1 +0.0%
Image multiple-10 1.07ms 1.00ms ±0.26ms 1 +0.0%
Image multiple-50 4.00ms 4.00ms ±0.76ms 1 +33.3%
Image multiple-100 9.80ms 9.00ms ±2.48ms 1 +12.5%

ActivityIndicator

Scenario Mean Median StdDev Renders vs Baseline
ActivityIndicator mount 0.10ms 0.00ms ±0.32ms 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 0.10ms 0.00ms ±0.32ms 1 +0.0%
ActivityIndicator size-small 0.00ms 0.00ms ±0.00ms 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 0.30ms 0.00ms ±0.48ms 1 +0.0%
ActivityIndicator multiple-10 1.53ms 1.00ms ±1.06ms 1 +0.0%
ActivityIndicator multiple-50 3.67ms 4.00ms ±0.62ms 1 +0.0%
ActivityIndicator multiple-100 8.53ms 8.00ms ±1.60ms 1 +14.3%

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 0.30ms 0.00ms ±0.48ms 2 -100.0%
Switch value-true 0.00ms 0.00ms ±0.00ms 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 2.07ms 2.00ms ±1.71ms 1 +0.0%
Switch multiple-50 11.13ms 9.00ms ±4.05ms 1 +0.0%
Switch multiple-100 23.20ms 22.00ms ±9.38ms 1 +37.5%

Button

Scenario Mean Median StdDev Renders vs Baseline
Button mount 0.70ms 1.00ms ±0.48ms 1 +0.0%
Button unmount 0.10ms 0.00ms ±0.32ms 0 +0.0%
Button rerender 1.00ms 1.00ms ±0.47ms 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 0.60ms 1.00ms ±0.52ms 1 +0.0%
Button multiple-10 6.53ms 6.00ms ±1.30ms 1 +0.0%
Button multiple-50 28.67ms 29.00ms ±16.49ms 1 +7.4%
Button multiple-100 32.07ms 24.00ms ±16.72ms 1 +26.3%

TextInput

Scenario Mean Median StdDev Renders vs Baseline
TextInput mount 0.30ms 0.00ms ±0.48ms 1 +0.0%
TextInput unmount 0.00ms 0.00ms ±0.00ms 0 +0.0%
TextInput rerender 0.30ms 0.00ms ±0.48ms 2 +0.0%
TextInput multiline 0.20ms 0.00ms ±0.42ms 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 8.60ms 8.00ms ±2.20ms 1 +14.3%

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 3.73ms 4.00ms ±0.59ms 1 +33.3%
View nested-100 8.93ms 9.00ms ±1.53ms 1 +28.6%
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 22.60ms 10.00ms ±22.29ms 1 +0.0%

Text

Scenario Mean Median StdDev Renders vs Baseline
Text mount 0.10ms 0.00ms ±0.32ms 1 +0.0%
Text unmount 0.00ms 0.00ms ±0.00ms 0 +0.0%
Text rerender 0.30ms 0.00ms ±0.48ms 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 10.53ms 10.00ms ±2.90ms 1 +42.9%

SectionList.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
SectionList native mount 5.43ms 5.10ms ±0.93ms 1 -21.6%

FlatList.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
FlatList native mount 5.80ms 5.44ms ±1.36ms 1 -41.0%

TouchableHighlight.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
TouchableHighlight native mount 1.53ms 1.46ms ±0.18ms 1 -30.3%

TouchableOpacity.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
TouchableOpacity native mount 1.80ms 1.70ms ±0.28ms 1 -45.7%

Pressable.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
Pressable native mount 1.61ms 1.60ms ±0.17ms 1 -36.1%

ScrollView.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
ScrollView native mount 3.51ms 3.36ms ±0.31ms 1 -16.9%

ActivityIndicator.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
ActivityIndicator native mount 1.54ms 1.42ms ±0.44ms 1 -43.0%

TextInput.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
TextInput native mount 2.23ms 2.18ms ±0.26ms 1 -46.7%

Switch.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
Switch native mount 1.31ms 1.19ms ±0.38ms 1 -31.3%

Button.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
Button native mount 1.63ms 1.54ms ±0.28ms 1 -40.8%

Modal.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
Modal native mount 1.26ms 1.21ms ±0.13ms 1 -0.7%

Image.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
Image native mount 1.67ms 1.59ms ±0.17ms 1 -29.7%

View.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
View native mount 1.02ms 0.95ms ±0.20ms 1 -33.7%

Text.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
Text native mount 1.19ms 1.14ms ±0.17ms 1 -34.2%

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@Saadnajmi Saadnajmi Saadnajmi approved these changes

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