Michael137 wrote:

FYI, I'm still investigating the details but internally one of our projects 
reported a substantial slowdown when compiling with debug-info. Most likely a 
pathological case with deeply nested macros, but it went from `0.5 s` total 
runtime to more than a minute. Most of the time being spent in 
`SourceManager::getFileID`. Will follow-up with more details once I found out

https://github.com/llvm/llvm-project/pull/163982
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