Hey there @Aquilus107! So the UESTATS files are basically snippets from the profiler, hope this helps!
Loading Statistics
To load statistics into Session Frontend Profiler:
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From the Unreal Editor Menu Bar, select Tools > Session Frontend.
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With Session Frontend open, select the Profiler tab.
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To open a file for profiling, select Load. A File Explorer winow will appear for you to select the
uestats
file you wish to open for profiling. -
After selecting a
uestats
file, click Open to load the file.
Source: