This emulator is kicking butt, all my games are running full speed pretty much flawlessly... except God of War, for some reason its slow as hell and pushes my GPU to 99-100% usage.
The God of War games have a serious GE timing issue with the emulator currently. What that means is that the game is internally rendering more frames than it could ever realisticallly display at any given time, unnecessarily pushing your GPU to the limit.
AFAIK, you can see it for your self by enabling both VPS and FPS display in the graphics settings in the UI.
It renders in excess of 3000 FPS, which is excessive, and will bring most lower end cards to their knees. (flips per second, not to be confused with the traditional FPS measurement that we're used to for performance in other games and apps).
The VPS counter is still the bonafide method of measuring performance in PPSSPP, anything below 60 means your system is struggling.
TL

R,
VPS is the one that you have look out for.
The FPS counter (as implemented in ppsspp)is just an internal measurement of how much the game is pushing, and is not affected by Unlimiting the VPS or Turbo. It is often a static number in games that are functioning properly, and can be either 30 or 60. It is not an indicator of your device's performance. It is only important to diagnose GE timing issues and internal slowdowns, among other things.
Also has any comparisons been done on speeds for the different formats, is iso faster then cso for example?
As for cso vs iso, the performance differences is negligable. You're better off using cso to save disk space. Take it from ector (Henrik) himself, the main dev behind this emulator:-
http://forums.ppsspp.org/showthread.php?tid=1769&pid=9381#pid9381
I guess PW has the same issue? It uses PSP fonts too.
Yep. The monhun games and the dissidia games (incorrect font spacing) are also among those which are affected when the emulator's fonts are used. Both require the original PSP fonts for proper font rendering and spacing.
Just updated my andriod version to the latest release which now has multiple save states. In the process it looks like it broke my 30+ hours P3P save state... :'(
Savestates are not transferable between revisions, unfortunately. This is rule of thumb for most emulators.