need help

[LunaMoo]

For your weird resizing problem, any chance you're using D3D backend? If yes, then switch to OGL and never go back;] ~ we listed some differences between the two quite recently and dunno if it's still the case but d3d backend always suffered from some window resizing problems. Could be also some Windows 10 weirdness through, no clue.

As for settings - avoid speedhacks and multithreading ~ it's not like you would need those ~ and just use as high rendering res and texture scaling as you want. Just a note rendering res at x4 will give you 1:1 pixel size on 1080p, if you want to use higher you should additionally use a downsampling shader like for example gauss posted by Bigpet here then you will get nice supersampling effect, without it all you would get is placebo.;p

Except some workaround hacks like "Lower resolution for effects" or "Depth Range Hack" which are there to fix some glitches, most settings are for people on much weaker devices or for testing and debugging.

Dunno "dexter" but if that's just typo for Daxter, then it should work fine as well as FFIV. In case of problems try using latest version from official site.
Don't remember what fps those games were running, but for the most part you should forget about 40-60 and if that's a "minimum" you can take, then no you don't have a "mood for retro" as that would get you into single digit fps range:X. Anyway most psp games ran at 30fps if you plan on changing that you can look into 60 fps patches, but you would have to learn how to do them yourself as they can be quite time consuming to make, the list we got for now is somewhat short even including buggy and unfinished patches.