All of those bugs were closed after being fixed years ago, nothing was actually changed upstream. F.
https://bugs.winehq.org/show_bug.cgi?id=46221
https://bugs.winehq.org/show_bug.cgi?id=50868
https://bugs.winehq.org/show_bug.cgi?id=35701

Freeze and crash of the client after a game still seems to happen unfortunately.

also, if you press alt+enter, the game toggles between windowed and fullscreen, which may help if it loses focus.

So far, I’ve had best luck while using the wine virtual desktop - suggests to me that there’s a wine renderer bug causing the invisible game issue. Not sure about the speed though.

nope

I may have the same issue but on bottles flatpak. For me, the game sometimes does this thing where the game doesn’t load, and when it does, it’s a 1x1 window (even though I am on gnome, not a WM) that I can’t interact with. I have had best reliability with having the virtual desktop enabled, and if the issue happens, open system monitor or whatever the equivalent of task manager on your distro is, and kill League Of Legends.exe, which closes the game and should let you press the reconnect button. I usually have to do this multiple times before the game decides actually make a window and load.