Reducing app startup speed with a large number of files

[Psycho-A]

I noticed that the more files we include in the project, the slower the application starts. If at 100-500 files the difference is almost invisible, then at 2000-5000 files the launch can take from 3 to 6 seconds for fast program. It feels like every file is unpacked right before launch, not when a file is requested in the program.

Is it possible to optimize it somehow?
I hate apps with tons of files, boxing them would be really cool!