dammit, it was in vain, I did a couple of cairo/pixman benchmarks, all point that there are performance regressions in upstream pixman compared to the one in fremantle

Honestly, not sure how to deal with that. But I guess it does not make sense to "upgrade" to something which brings performance regressions, esp when there are no bugs in stock pixman. afaik.

It is a tricky situation, as on couple of benchmarks upstream performs way better than stock. But it seems that on those that affect n900 most, it performs worse (16bit operations).

Maybe someone should raise a bug against upstream pixman, IDK. I'll try different versions, will choose the latest that performs well on n900.