Write more details, what exactly you did? Which installation did you use, which libgarmios.so, what lags? Which version was on your SGS2, 1.49 or 2.01, there is no 2.02 version!?
Try 1.49 too, cause 2.01 isn't too much stable on all devices, it was good adapted for 960x540 and 800x480, there is many different libgarmios.so 1280x800, so use button search and try more them, until you found one which is ok for your device, there is no some unique solution, cause generally Garmin SP wasn't developed for all devices, but for Asus Pad2fone, and we can't expect that it works well on all our devices, until Garmin publish Garmin SP for all Android devices, we'll have to fight with this modified version from Asus Pad2fon.