Check my link on OpenGL. I linkned to it in my first post, put I'll link it here explicitly.http://www.fpsece.net/forum2/viewtopic.php?f=39&t=3615&p=28279#p28279
Specifically, click on the Google Docs link to get more info on the options for OpenGL. Initially you probably should leave all the options off except Print FPS and probably framelimiter. You may need frameskip also. Sometimes framlimiter + frameskip gives worse performace so you might need 'special framlimiter' instead of 'framelimiter'. In addition, you may need offscreen drawing and alpha multipass, you can start with those or you can wait and try them if there are issues. If you change the offscreen drawing and multipass you will likely need to exit and reload game for change to take effect. Most of the rest of the options are for enhanced graphics/colors or for special fixes.
I don't have a mali-400 GPU, so I don't have any experience with it. But, the release notes on the latest version of FPSE (11.29) say that you shouldn't need to do anything - shouldn't need the dynamic interpreter from system options or go through special BIOS setup via loading tekken.
Your CPU is very powerful, and you should not have any issues with monocore in software mode (softGPU) as long screen filtering is not enabled. Verify that it is not enabled. If it is not enabled and you still get low FPS then ... something else is wrong.
To show FPS (frames per second) enable it in the video options (Print FPS).
I still think the issue may be with that specific game. Try another game. I'll try that game if I can. Is it "Havest Moon: Back to Future" or is it "Harvest Moon: Back to Nature"?
Also, from looking at old threads here on the forums I see that "Harvest Moon: Back to Nature" (Harvest Moon: BTN) is one of the most difficult games to emulate, along with Tekken3 - at least I think so. click here for more info
About sound: from looking at the fourms it looks like you need the 'spusync' enabled in the sound options. That won't make it play faster though.