You are going to have to define slow because slow not the same for everyone. Fast for a turtle is slow for a rabbit and fast for a rabbit is very fast for a turtle, it depends if you are a turtle or a rabbit as in your definition of fast. So are you the rabbit or the turtle, how slow is slow for you?
When I launch Borderlands 3 it takes about 1 minute to get to the menu and once I continue my game it takes about 15 seconds to load into the map. I have no idea what the loading times are in Windows but from my experience compared to other games Borderlands 3 is just a very heavy game taking quite a bit out of your system even if you have better specs than recommended and on to op that it also running on a translation layer aka Proton.
Best thing to probably do is for BL3 is to reply to the existing issue with logs and stuff launch times etc.
Compatibility Report Name of the game with compatibility issues: Borderlands 3 Steam AppID of the game: 397540 System Information GPU: AMD Radeon VII Driver/LLVM version: Mesa 20.0.99/10.0.0 Kernel...
github.com
No idea if you are running CSGO natively or through Proton, if the later it might be worth switching to the native version and see if there is a difference and if not also create a reply to the existing issue for the game.
Compatibility Report Name of the game with compatibility issues: Counter-Strike Global Offensive Steam AppID of the game: 730 System Information GPU: AMD Radeon R7 445 Driver/LLVM version: Mesa 18....
github.com