Wait, there's an option to host Overleaf locally? Is there any cost associated with this, or any restrictions on the number of users?
[Edit] Found some more info on this, there's a free community version, and then an enterprise version with a fee that lets you self-host but adds features like SSO and support from the company. I'll definitely have to look more into both of these options. Thanks, OP, for making me aware of this!
Was it EVER faster though? My experience with Windows has always been that they release new versions based on upcoming hardware specs and unless you spend top-dollar on the very latest hardware for their next release, you are going to see things moving slower on the new desktop. That's one of things I've enjoyed about linux, you can pretty much always upgrade the OS on an older machine without concern of taking a hit on the performance, and sometimes you even get a boost.