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

[acoates-ms]

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

[github-actions]

Performance Test Results

Branch: nomorecoreabi
Commit: 18b6e0f2
Time: 2026-05-05T20:18:18.971Z
Tests: 161/161 passed

✅ Passed

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

SectionList

Scenario	Mean	Median	StdDev	Renders	vs Baseline
SectionList mount	5.00ms	5.00ms	±0.67ms	1	+0.0%
SectionList unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
SectionList rerender	11.50ms	11.50ms	±1.58ms	2	+9.5%
SectionList with-3-sections-15-items	5.10ms	5.00ms	±0.74ms	1	-9.1%
SectionList with-5-sections-50-items	6.00ms	6.00ms	±1.49ms	1	+0.0%
SectionList with-10-sections-200-items	5.30ms	5.00ms	±0.67ms	1	-9.1%
SectionList with-20-sections-200-items	8.90ms	6.00ms	±10.39ms	1	+20.0%
SectionList with-section-separator	1.90ms	2.00ms	±0.32ms	1	+0.0%
SectionList with-item-separator	2.60ms	2.50ms	±0.97ms	1	+25.0%
SectionList with-header-footer	1.90ms	2.00ms	±0.32ms	1	+0.0%
SectionList with-section-footer	1.20ms	1.00ms	±0.42ms	1	-50.0%
SectionList with-sticky-section-headers	2.50ms	2.00ms	±2.01ms	1	+0.0%
SectionList with-empty-list	0.50ms	0.50ms	±0.53ms	1	-50.0%
SectionList with-50-sections-1000-items	1.50ms	1.50ms	±0.53ms	1	-25.0%

FlatList

Scenario	Mean	Median	StdDev	Renders	vs Baseline
FlatList mount	4.50ms	4.00ms	±0.97ms	1	+0.0%
FlatList unmount	0.10ms	0.00ms	±0.32ms	0	+0.0%
FlatList rerender	9.40ms	9.50ms	±1.65ms	2	+5.6%
FlatList with-10-items	4.50ms	4.00ms	±0.71ms	1	+0.0%
FlatList with-100-items	5.40ms	5.00ms	±1.51ms	1	+0.0%
FlatList with-500-items	4.60ms	5.00ms	±0.52ms	1	+25.0%
FlatList with-1000-items	4.70ms	4.50ms	±1.70ms	1	+12.5%
FlatList horizontal	4.60ms	5.00ms	±1.26ms	1	+0.0%
FlatList with-separator	2.40ms	2.00ms	±0.97ms	1	+0.0%
FlatList with-header-footer	1.50ms	1.50ms	±0.53ms	1	-25.0%
FlatList with-empty-list	0.80ms	1.00ms	±0.42ms	1	+100.0%
FlatList with-get-item-layout	1.70ms	2.00ms	±0.67ms	1	+100.0%
FlatList inverted	1.50ms	1.50ms	±0.53ms	1	+0.0%
FlatList with-num-columns	2.90ms	3.00ms	±0.57ms	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	1.60ms	1.00ms	±1.58ms	2	+0.0%
TouchableOpacity custom-active-opacity	0.60ms	1.00ms	±0.52ms	1	+0.0%
TouchableOpacity disabled	0.70ms	1.00ms	±0.48ms	1	+0.0%
TouchableOpacity with-all-handlers	0.70ms	1.00ms	±0.48ms	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	1.60ms	1.50ms	±0.70ms	1	+50.0%
TouchableOpacity multiple-10	6.00ms	5.00ms	±1.89ms	1	-16.7%
TouchableOpacity multiple-50	27.00ms	26.00ms	±2.75ms	1	-10.3%
TouchableOpacity multiple-100	38.00ms	45.00ms	±13.67ms	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	0.30ms	0.00ms	±0.48ms	2	-100.0%
ScrollView children-20	3.60ms	3.00ms	±1.06ms	1	-25.0%
ScrollView children-100	17.93ms	16.00ms	±5.43ms	1	+0.0%
ScrollView horizontal	3.90ms	3.50ms	±1.29ms	1	-12.5%
ScrollView sticky-headers	2.90ms	3.00ms	±1.10ms	1	+0.0%
ScrollView scroll-indicators	0.80ms	1.00ms	±0.42ms	1	+0.0%
ScrollView nested	1.40ms	1.00ms	±0.70ms	1	+0.0%
ScrollView content-container-style	1.10ms	1.00ms	±1.79ms	1	+0.0%
ScrollView children-500	19.67ms	19.00ms	±3.33ms	1	+0.0%

TouchableHighlight

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableHighlight mount	0.50ms	0.50ms	±0.53ms	1	+0.0%
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	0.60ms	1.00ms	±0.52ms	1	+Infinity%
TouchableHighlight custom-active-opacity	0.40ms	0.00ms	±0.52ms	1	+0.0%
TouchableHighlight disabled	0.40ms	0.00ms	±0.52ms	1	+0.0%
TouchableHighlight with-all-handlers	0.30ms	0.00ms	±0.48ms	1	+0.0%
TouchableHighlight with-hit-slop	0.40ms	0.00ms	±0.52ms	1	+0.0%
TouchableHighlight nested-touchables	1.00ms	1.00ms	±0.00ms	1	+0.0%
TouchableHighlight multiple-touchables-10	3.40ms	3.00ms	±1.35ms	1	+0.0%
TouchableHighlight multiple-touchables-50	14.50ms	14.00ms	±1.84ms	1	+12.0%
TouchableHighlight multiple-touchables-100	25.60ms	24.50ms	±2.91ms	1	+8.9%

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	0.50ms	0.50ms	±0.53ms	1	+Infinity%
Pressable with-style-function	0.40ms	0.00ms	±0.52ms	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	0.40ms	0.00ms	±0.52ms	1	-100.0%
Pressable multiple-10	3.00ms	3.00ms	±0.38ms	1	+0.0%
Pressable multiple-50	15.67ms	15.00ms	±1.84ms	1	+7.1%
Pressable multiple-100	17.27ms	13.00ms	±10.20ms	1	+8.3%

Modal

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Modal mount	0.50ms	0.50ms	±0.53ms	1	+Infinity%
Modal unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Modal rerender	0.60ms	1.00ms	±0.52ms	2	+Infinity%
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	0.40ms	0.00ms	±0.52ms	1	+0.0%
Modal with-callbacks	0.30ms	0.00ms	±0.48ms	1	+0.0%
Modal rich-content	1.90ms	2.00ms	±1.20ms	1	+0.0%
Modal with-accessibility	0.40ms	0.00ms	±0.52ms	1	+0.0%

Image

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Image mount	0.10ms	0.00ms	±0.32ms	1	+0.0%
Image unmount	0.00ms	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	0.10ms	0.00ms	±0.32ms	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	0.20ms	0.00ms	±0.42ms	1	+0.0%
Image multiple-10	1.00ms	1.00ms	±0.00ms	1	+0.0%
Image multiple-50	4.00ms	4.00ms	±1.31ms	1	+33.3%
Image multiple-100	8.13ms	8.00ms	±0.99ms	1	+0.0%

ActivityIndicator

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ActivityIndicator mount	0.20ms	0.00ms	±0.42ms	1	+0.0%
ActivityIndicator unmount	0.10ms	0.00ms	±0.32ms	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	0.10ms	0.00ms	±0.32ms	1	+0.0%
ActivityIndicator with-color	0.20ms	0.00ms	±0.42ms	1	+0.0%
ActivityIndicator not-animating	0.20ms	0.00ms	±0.42ms	1	+0.0%
ActivityIndicator with-accessibility	0.30ms	0.00ms	±0.48ms	1	+0.0%
ActivityIndicator multiple-10	0.73ms	1.00ms	±0.46ms	1	+0.0%
ActivityIndicator multiple-50	4.33ms	4.00ms	±1.11ms	1	+0.0%
ActivityIndicator multiple-100	8.20ms	8.00ms	±1.15ms	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	0.50ms	0.50ms	±0.53ms	2	+0.0%
Switch value-true	0.20ms	0.00ms	±0.42ms	1	+0.0%
Switch disabled	0.10ms	0.00ms	±0.32ms	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	0.10ms	0.00ms	±0.32ms	1	+0.0%
Switch multiple-10	1.67ms	2.00ms	±0.49ms	1	+0.0%
Switch multiple-50	9.00ms	8.00ms	±2.65ms	1	-11.1%
Switch multiple-100	17.87ms	17.00ms	±2.47ms	1	+6.3%

Button

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Button mount	0.60ms	1.00ms	±0.52ms	1	+0.0%
Button unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Button rerender	1.50ms	1.00ms	±1.27ms	2	+0.0%
Button disabled	0.70ms	1.00ms	±0.48ms	1	+0.0%
Button with-color	0.60ms	1.00ms	±0.52ms	1	+100.0%
Button with-accessibility	0.70ms	1.00ms	±0.48ms	1	+0.0%
Button multiple-10	5.93ms	6.00ms	±1.16ms	1	+0.0%
Button multiple-50	21.27ms	25.00ms	±8.40ms	1	-7.4%
Button multiple-100	16.60ms	15.00ms	±3.22ms	1	-21.1%

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	0.10ms	0.00ms	±0.32ms	2	+0.0%
TextInput multiline	0.20ms	0.00ms	±0.42ms	1	+0.0%
TextInput with-value	0.10ms	0.00ms	±0.32ms	1	+0.0%
TextInput styled	0.20ms	0.00ms	±0.42ms	1	+0.0%
TextInput multiple-100	8.07ms	8.00ms	±1.10ms	1	+14.3%

View

Scenario	Mean	Median	StdDev	Renders	vs Baseline
View mount	0.20ms	0.00ms	±0.42ms	1	+0.0%
View unmount	0.10ms	0.00ms	±0.32ms	0	+0.0%
View rerender	0.00ms	0.00ms	±0.00ms	2	+0.0%
View nested-50	3.93ms	4.00ms	±1.22ms	1	+33.3%
View nested-100	8.13ms	8.00ms	±1.30ms	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	18.53ms	11.00ms	±14.30ms	1	+10.0%

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	0.20ms	0.00ms	±0.42ms	1	+0.0%
Text nested	0.20ms	0.00ms	±0.42ms	1	+0.0%
Text styled	0.20ms	0.00ms	±0.42ms	1	+0.0%
Text multiple-100	8.87ms	8.00ms	±1.68ms	1	+14.3%

SectionList.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
SectionList native mount	4.36ms	4.30ms	±0.39ms	1	-33.9%

FlatList.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
FlatList native mount	4.28ms	4.07ms	±0.48ms	1	-55.9%

TouchableHighlight.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableHighlight native mount	1.29ms	1.26ms	±0.09ms	1	-39.4%

TouchableOpacity.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableOpacity native mount	1.47ms	1.46ms	±0.07ms	1	-53.5%

Pressable.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Pressable native mount	1.42ms	1.36ms	±0.21ms	1	-46.0%

ScrollView.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ScrollView native mount	3.13ms	2.90ms	±0.45ms	1	-28.4%

ActivityIndicator.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ActivityIndicator native mount	1.39ms	1.20ms	±0.64ms	1	-51.6%

TextInput.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TextInput native mount	2.00ms	1.87ms	±0.33ms	1	-54.2%

Switch.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Switch native mount	1.22ms	1.03ms	±0.44ms	1	-40.5%

Button.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Button native mount	1.63ms	1.61ms	±0.17ms	1	-38.2%

Modal.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Modal native mount	0.90ms	0.86ms	±0.09ms	1	-29.2%

Image.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Image native mount	1.97ms	1.77ms	±0.51ms	1	-21.6%

View.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
View native mount	1.01ms	0.98ms	±0.10ms	1	-31.4%

Text.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Text native mount	1.20ms	1.16ms	±0.19ms	1	-33.3%