HKGaming

Using the upscaler with frame generation performs flawlessly with my RTX 4090 in standard GTA V. However, when running it alongside the LSPDFR mod, the results are inconsistent. Sometimes it crashes repeatedly, while other times it runs smoothly for a few hours. So, to directly answer your question—at least for DLSS—the answer is no; it's not entirely stable with LSPDFR.
One suggestion to improve performance, especially if you experience lag after extended playtime, is to increase your system's VRAM allocation. You can do this by navigating to Advanced System Settings in Windows > Performance. Adjusting this setting may help mitigate the performance issues.

Ultimate backup overall is great... but I am a bit disappointed with the partner part of it, or maybe there is something I am missing.

Why can't my partner shoot from my vehicule? or if I have multiple partners from thbe back of my van, when I am being shot at? Why Can't my partners use turrets or other weapons on any vehicules of the games? If I missed something please share the knowledge, if this is impossible with this mod, it's a shame because there are many other mods out there that kinda do this well, but unfortunately they are incompatible with LSPDFR. Any info and help would be nice.

Apparently, I had some leftovers from 5real, that conflicted with the EUP menu. What I found is if anyone wnats to use 5real with LSPDFR the EUP menu will need at least 2 attempts to load.

Without 5real, on the latest LSPDFR and version of the game, everything works as intended! 

After 3 installs it finally works!

Got it, I guess I will be back with an updated game but with also a bag of other problems. I will let you know how it goes.