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Improve performance of pytest discovery for large test suites (#25974) #2540

Job	Run time
Lint	1m 6s
Python Tests (ubuntu-latest, 3.x)	1m 4s
Check Python types	36s
Set up	3s
Python Tests (windows-latest, 3.13)	1m 53s
Python Tests (windows-latest, 3.x)	2m 26s
Python Tests (ubuntu-latest, 3.13)	59s
Python Tests (windows-latest, 3.10)	2m 13s
Tests (ubuntu-latest, 3.x, debugger)	4m 35s
Tests (ubuntu-latest, 3.x, ts-unit)	5m 30s
Tests (ubuntu-latest, 3.x, single-workspace)	4m 44s
Tests (ubuntu-latest, 3.x, multi-workspace)	5m 34s
Python Tests (ubuntu-latest, 3.10)	54s
Tests (ubuntu-latest, 3.x, venv)	5m 18s
Tests (windows-latest, 3.x, debugger)	8m 30s
Tests (windows-latest, 3.x, ts-unit)	9m 30s
Tests (windows-latest, 3.x, single-workspace)	10m 41s
Tests (windows-latest, 3.x, multi-workspace)	8m 9s
Tests (ubuntu-latest, 3.x, functional)	4m 14s
Tests (windows-latest, 3.x, functional)	7m 41s
Tests (windows-latest, 3.x, venv)	8m 11s
Create VSIX (windows-latest, x86_64-pc-windows-msvc, win32-x64)	7m 26s
Create VSIX (ubuntu-latest, x86_64-unknown-linux-musl, alpine-x64)	3m 59s
Create VSIX (ubuntu-latest, x86_64-unknown-linux-musl, linux-x64)	3m 46s
Create VSIX (windows-latest, aarch64-pc-windows-msvc, win32-arm64)	7m 11s
Smoke tests (windows-latest, win32-x64)	3m 3s
Smoke tests (ubuntu-latest, linux-x64)	1m 54s
	2h 1m 10s

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