PyInstaller 4.0 (the one on PyPI) doesn’t fully support 3.8 but most of the 
3.8 issues were fixed so you usually can get away with it. PyInstaller 4.1 
fully supports 3.8 but it isn’t out yet. You can use the development 
version on Github. 

As for the increases in size and startup time - I’m not seeing this when I 
try freezing print("hello") with Python 3.7 and 3.8. I get 7.1MB both 
times. Try building in --onedir mode then compare what’s different or being 
added. Presumably 3.8 is including a package you don’t need which 3.7 
doesn’t have installed. Startup time is mostly your antivirus giving 
everything a scan as a onefile app unpacks itself. The unzipping itself 
should be almost instant for such a small program. But that 4 seconds 
latency suggests something else is happening.

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