I have a Unity project in 2019 that runs at 210fps+ with CPU times of main 4.7ms and render thread 0.7ms
The exact same scene in 2023 and it runs at 85fps with CPU times of main 11.7ms and render thread 5.0ms
Why is there such a big difference, with their being 250% more CPU time being used and a massive 714% more render thread time. All the project settings are the exact same for both. It really can’t be possible that 2023 is this much slower than 2019 can it?
Unity 2019
Unity 2023
I suggest filing a bug report to get this looked into
It’s better to run the Profiler on the editor to make sure that it’s actually that much slower. The numbers in the statistics windows has always been flaky to be reliable.
To build on what @Neonlyte said: iirc, before 2021 the stats view reduced the CPU timings by the EditorLoop timings, which it no longer does (and was veeery fuzzy math to begin with).
Use the Profiler and maybe Profile Analyzer to compare your performance in 2019 to that in 2023 and not the Stats view.