NagyDonat wrote:

You're right, repeating the same measurement produced significantly different 
results:

| Project | before this PR | this PR | Ratio |
| --- | --- | --- | --- |
| memcached | 25.70 | 28.12 | 109.4% |
| tmux | 74.18 | 74.30 | 100.2% |
| curl | 219.55 | 217.06 | 98.9% |
| twin | 52.27 | 47.75 | 91.4% |
| vim | 167.13 | 163.41 | 97.8% |
| openssl | 431.63 | 422.84 | 98.0% |
| sqlite | 959.32 | 941.19 | 98.1% |
| ffmpeg | 1353.04 | 1348.64 | 99.7% |
| postgres | 436.02 | 425.13 | 97.5% |
| tinyxml2 | 31.80 | 32.39 | 101.9% |
| libwebm | 67.39 | 65.77 | 97.6% |
| xerces | 201.98 | 225.78 | 111.8% |
| bitcoin | 175.57 | 173.28 | 98.7% |
| protobuf | 2585.72 | 2367.59 | 91.6% |
| qtbase | 3988.95 | 3984.71 | 99.9% |
| openrct2 | 1210.14 | 1175.08 | 97.1% |
| total | 11980.39 | 11693.04 | 97.6% |

At least now I know that our environment is noisy and I will need to repeat 
measurements multiple times to get usable results :sweat_smile:

https://github.com/llvm/llvm-project/pull/139939
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