Please Riot, fix your magnificent client

I don't want to be punished and to be classified as a ''leaver'' because of your beautiful and fancy client tech, you made it pretty and all that stuff, but it performs terribly and it's not the first time players tell you this. So. Please. Make up your mind and fix this, or do something to ACTUALLY get better performance. I don't want my screen to go completely black, without having the ability to solve it but restarting the computer while having HIGH specs. And now Im punished because of your stuff. Don't take this as hate, eventho im pretty angry, just as an advice.