oh thats new for me, heard Slimjet could probobly handle better
Nah, Slimjet like all the Chromium browers is not in the same league with Gecko browsers in being able to handle accumulating tabs.
who open 200 tabs at same time?!
I've done it.

8 or 9 Malware Tips tabs, maybe a dozen tabs of Major Geeks downloads I want to take a closer look at, tabs from numerous other computer sites, half a dozen YouTube videos, a dozen politics tabs, tabs with journal abstracts, a few sports tabs, updating maps of the civil wars in Iraq and Syria, it can start adding up. But only on a Gecko browser can you get away with accumulating tabs like that.
Some people accumulate more tabs than me, and they actually get extensions to allow them to do a search through their tabs.