[Solved]Why is OpenGL slower now?

[LunaMoo]

Then it's most likely about core profile, but that change will not be reverted for the sake of some 11 yo netbook or something as it was affecting a lot more positively.

Sorry, but the reality is, if you plan to stick to ancient device, you might as well stick to old software version as well. Developement of complex software like emulators just like operating systems etc. requires evolving towards new technologies and new hardware at cost of dropping support for old hardware that doesn't work in modern ways at all or works worse, PPSSPP already dropped some hardware completely and eventually will drop out more, that's just how it is, you will not be able to update ppsspp forever on your hardware unless you also upgrade that hardware;p.