Opera's performance has gone to hell 18.0.5461.104
Since the latest updates (I'm currently on 18.0.5461.104), RAM consumption has increased, with the same usual number of tabs incredibly filling up my 16GB of available RAM. YouTube tabs with 800MB down to 1.5GB of RAM each. Lag, and the CPU never stops without interacting with a page. I have to restart Opera often. It's as if the rollback of closed pages never closes. I've noticed that closing pages doesn't immediately free up RAM. They should add internally that when a tab exceeds 900MB, I should close it or restart the page, since the internal garbage collector doesn't seem to be working.