Big solution, many projects… suddenly IntelliSense feels drunk.
Root cause
Visual Studio keeps:
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Symbol cache per project
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Roslyn analysis results
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Design-time builds running in background
These accumulate and slow down parsing.
Fix (safe & underrated)
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Disable design-time builds for large solutions
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Clear ComponentModelCache periodically
%LOCALAPPDATA%\Microsoft\VisualStudio\<version>\ComponentModelCache
Why it works
Forces VS to rebuild symbol graphs cleanly.