[Crash] League froze 1 minute in, could not task manager. Game ran at 10 FPS after with no sound.

Basically, 1 minute into my game League crashed on me. I attempted to task manager out to reconnect, but to no avail. I had to go into sleep mode, log off my computer user profile and then go back to the game. The game ran again, but at 10-20 fps and sound was completely disabled. Every time someone got a kill, the kill description only lasted 0.2 seconds before disappearing, and the text was also missing with only icons showing up. Every kill dropped my frames to ~5. I even saw moments where my tower fired 2 shots at once.

It was very frustrating to deal with this. While it did happen in a normal, I want to ask what I can do to prevent something like this from happening ever again. Thank you.

The issue seems to resolve if I find a way to exit the game and reconnect from client, but nonetheless it was ridiculous, and such a thing is especially volatile when I'm laning. The biggest problem is that I could not task manager to deal with the problem the moment it appeared. Is there a way to task manager out of league easier when it freezes or crashes like this?