When i watch a video, i scroll a page or i am in the settings or anything that is related to using Opera it stutters and this is already a huge problem. I deleted all cookies, cache, history, but i still experience the same shit stuttering.
Check if deleting the "session"files helps.
And, as a later suggestion, make a single thread like it was with old Opera 12, becuase it is really annoying to navigate in task manager to 100 opera.exe.
You can start Opera with parameter --single-process