I spent 4 hours last night following this guide for installing approximately 50 compatible mods to get Fallout New Vegas running in 2023 with lots of performance optimizations and bug fixes. (If you just look up popular mods a lot of them have been broken for years.) The vanilla Steam install took forever to load, had awful performance, and crashed when I left the starting building. Now it runs great.

The documentation is imo an example of great technical writing, too.

https://vivanewvegas.moddinglinked.com