Well since i have been using fpse for almost a year i thought it might be a good idea to point out its flaws so far .I hope this will help the dev to improve the overall experience from the emulator.
To begin with i find fpse easy to use even for newbies,although i cant seem to find anywhere what each option does when i toggle it on or off (on epsxe it informs me on how it will impact on the performance at least)especially the newly added options.
Unlike epsxe fpse pauses the game when i mess up with the settings and it has more dynamic access to options
In some games there is a slowdown on 2d static menus like chrono cross and final fantasy tactics and is kind of annoying(i am talking about huge drops from 60fps to 29-37) considering that the whole other game runs flawless
In other games like koudelka the sound on video sequences in game is too bad.sound skips in speech sequences making it impossible to understand what the characters are talking about.
Last but not least the BIGGEST flaw so far on fpse is that every single update fixes something but breaks something else that worked.One piece of advice i learned so far <<dont update fpse unless you really have to>>
As far as Opengl plugin, it is very buggy to even consider an option and a lot slower than bitting mode
I do believe that psx can run on max fps even on singlecore devices(1ghz+) without slowdowns but it requires a really talented dev with a lot of free time to spend on his project.
I wont leave negative comments on google play since i dont expect an emulator to be perfect, although it would please me if you take into consideration my feedback and make the emulator more stable and more compatible