I have some questions about RPCS3

1. When caches are updated, version is bumped to force a recache
2. It's a higher accuracy mode, but it comes at a performance price
3. Some games limit themselves already, if they do, don't use the emulator's limiter, otherwise you're adding useless overhead.
4. As long as you set a base resolution that the game supports (recommended 720p as it's supported by every game), it should support any scaling, except for any eventual bug that causes a black screen or something alike. Of course, scaling can break graphics in some scenarios, as the games are meant to be ran at their supported resolutions.
5. I didn't understand, is that Minimum Processor State some Windows setting?
6. Number of hardware threads dedicated to heavy simultaneous SPU tasks. Auto is default.
7. GPU Texture Scaling uses the GPU for some operations like blitting. It may cause graphical bugs in some scenarios, but overall it's fine. Disabling it decreases performance.