When should I report an issue?

[Rekrul]

I'm having an issue with a game, Death Jr. 2, running MUCH more slowly than any other game I've tried. It's completely unplayable unless I check Disable Slower Effects, then it runs fine.

The game doesn't seem the most graphically intense game, nor is there a lot of action on the screen, so it seems odd that it runs more slowly than any other game I've tried. The only other game I had slowdown on was Spider-Man 3 at the start when there are a lot of particle effects on the screen. This game doesn't have anything like that.

I don't want to waste the devs' time if this isn't really an issue, but on the other hand, if PPSSPP is having issues playing this game, they should probably know about it.