each cod game also costs around 450 million dollars to make, so i can’t help but imagine that some of the file size bloat is caused by a need to “justify” the budget in some way. because as we all know, 300gb games have so much more game when compared to a measly 60gb game. you won’t be getting dynamically sized horse balls in a game that only takes up 60gb.
do you have the steam version or gog? i played the steam version on windows 11 last year and had no more problems than usual. also if you’re using the steam version, you might have to make sure it’s not installed within Program Files or Program Files (x86). those install locations can cause problems with mods.
you might also benefit from installing the 4gb patch in addition to IStewieAI’s engine tweaks. a lot of the mods in the first few sections of the viva new vegas guide are pretty much essential in order to play the game with minimal bugs and crashes. also some of the “crash fixing” mods cause problems in windows 10 and 11.
hopefully one of the above things works. i had to find a lot of those things out the hard way, it can be a pretty finicky game. really fun though.