How does your PC not slow down to a snail's pace at that point? I usually have 8 tabs open at most (7 of them are pinned and 3 of the pinned tabs are suspended, so really, I only have 5 active tabs).
Those are rookie numbers, I haven't hit anything under 200 tabs in almost a year when I accidentally closed the session in a way where tabs couldn't be recovered
And PC slows down only if tabs are fully loaded, simply having them open but not loaded doesn't consume more than couple KBs tops. I got like 12 loaded and the rest suspended for example