Really? I’m having a very dissimilar experience, and am also on Manjaro. Drivers were a peach to install and I get at least as good as performance on windows…to the extent that the dual boot has (over the years) become just a single boot. I’m even running a valve index on it - Alyx runs smooth. Built in 2019.
TBH I’m surprised at a lot of these threads about Nvidia as it’s just been a few times that the drivers didn’t work out on an update and I had a black screen. But I’ve had almost as many breaking issues from non Nvidia related stuff in its lifetime.