@DavyP

OK, buffer synchronization added, the results(same conditions as in previous runs):

JBenchmark - 3400

JBenchmark2:
landscape - 1002
portrait - 920

After all there WERE multiple repaint events coalesced into a single one for JBenchmark , anyway, everything is fine now. What I did not expect is higher result for JBenchmark2

Later today I will try to upload cvm code on gitorious, so you can look into it and run the benchmarks on your own if you wish. Just have in mind that my libcvm is compiled with -mvfp, -mcortex-a8 and export CVM_ARM_HAS_WMMX=true, so your result might be a little bit lower because of missing those optimizations . I suspect my cvm won't work correctly on Harmattan (as I removed pixmap rotation), but that could be easily fixed by using appropriate #ifdefs

I wonder if using QML or GLES will speed rendering. But as for now a speedup of 16% for landscape and 21% for portrait seems enough.