On the Cello side, the 1000-GF dispatch bottleneck is gone, and that does seem to have improved things by 20% or so. But I still get 10fps. This I presume is the step-function effect: I will not see a change in fps until I get fast enough to reach the next step in improvement, like 20fps.
My next effort will be to implement display lists just at the widget level, so the containers (stacks and rows) will still go through their logic on each frame, but when it is time to draw a slider track or slider thumb (possibly even the combo) those will be done by display-lists. Stay tuned.
kt