D5 2.7 Problem

hi, 2 days ago just update to 2.7 and everything good no problem, but after im gonna make animation video, the problem come, all fine before i click video icon, after i click that its become to lag, i just go 1 fps, i think before its my pc problem, so i update the graphic card, and clean some cache on my pc, and that still happen, so i decide to download the 2.6 version, and everything normal, no lag again,
so i just want to know, what happen,?
my graphic card so hot after update to 2.7
i use 3080 12 gb vram graphic card, 32 ram, and ryzen 3 3700x, its my fault to ignore the note to not update if u still have project on going, but i just want to know what happen, its gonna fix in the future?

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