While you've likely been enjoying GBA emulation for years, on various platforms, the PlayStation Vita hasn't always had an easy time of it. Despite being a very similar form factor to the original GBA, and still relatively portable, the handheld never made for an ideal platform to emulate Game Boy Advance games on. mGBA is still making progress on improving GBA emulation on the Vita, while gpsp has been dealing with a major bug, which causes noticeable stuttering ingame. That's not the case anymore, though, as Frangar, developer of gpsp, has made a significant update to the emulator which fixes the broken dynarec that has been plaguing it for the past three years. The bugfix, which allows for "a big increase in performance", has been merged into Libretro's master branch, and should be available to try out in the next nightly version of RetroArch.