build starts very slow despite fast in editor

When I start in the editor, it starts literally right away, while for Window .exe file, it takes minutes to start.

Looking at Task Manager while starting the build, I notice that the memory increases to about 900 Mb, but it increases very very slowly until ~250 Mb then jumps to 900 Mb, then the build starts.

Speed during the run time is as smooth as expected, but just the starting moment is unexpected.
The build contains large meshes, so I guess that can be an issue, but another build with
same meshes but with different game purpose seems to start much faster (with same memory~900 Mb).

Please advice me where to start looking!

a lot of possible reasons!

but I’d advice to check import settings of large graphics and audio clips (wrong settings could make them to fully load and decompress at startup, instead of keep unloaded or compressed).

the second is to check a runtime instantiation of a lots of your prefabs clones.

if none of this… well, unity store hasnt telepathy plugin yet :slight_smile: it would be needed to see your whole project I guess…