Fps drops, screen tearing and stuttering

Hello everyone! A few months ago league was running just fine, smooth gameplay and 200-300fps. Recently my fps has been getting worse and worse. I have a 144hz monitor and I cant even get a stable 144 fps, frequent drops to 100 and even below in team fights. It has gotten even worse since I bought a rtx 2060. I have a ryzen 7 2700x, 16gb 3200mhz ram and the game is installed on an ssd. It's unplayable sometimes, farming is really hard and it's impossible to perform in team fights. I have triead everything, reinstalling windows, ddu my drivers, updating bios and so on.. I can't be the only one?
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