20 FPS (40 man AoE scenario) on top of the line computer (dec 2019)

Hi,
i have a computer with the following specs : i9 9900k (8 cores), Geforce RTX 2080ti, and 16Go ram @3600, SDD 512Go Evo. So it's top of the line, as far desktop gaming computers go in dec of 2019.
I should be running this goddamn game at 500000 FPS no matter what it throws at me, but no, instead my FPS dives into the low 20s whenever i'm in a 40 man raid and everyone goes AoE crazy. (we're doing the EoF farm event)
I mean... 20FPS! It's not like i'm running this game on my phone, come on!

Now, after reading a number of forums, i learned that it is due to how the game was coded back then, for 32 bit systems, and that the game cannot use more than 1 or 2 cores, and no more than 2 gigs of ram. Ok, i get it.

Now though, we're in 2019, WotLK was released 10 years ago . So is there no way whatsoever to fix that?
So far i tried to add the SET processAffinityMask "0" line to my Config.wtf file, it didn't work. I tried to add SET maxFPS "0" too, didn't help. I tried to use that program that supposedly makes it so that WoW.exe can use up to 3 gigs of ram.... it did help either. Also, tweaking my Nvidia settings to max performance for WoW.exe doesn't change a thing.

Is there no way to solve this problem?

Nope, that's wotlk for you.
Just feel free to jack your settings up as high as they go, you won't see any performance decrease. You'll have a much better time in a more common 25man raid or PVP (except for AV first battle).