run the attachment rod-performance.zul
scroll down to trigger rod
compare different ZK versions
non degrading render time
Especially in this simple case columns/components in cells have FIXED widths.
Some how combobox/bandbox components have a bad effect on performance
try replacing a combobox in each cell ... (=> ~10s render time)
replacing the combobox in the first column, reduces the render time a lot.
In any case it is unexpected to see so many calls to fireSized -> and more surprising each of them seems to change some css resulting in forced reflows (all widths are fixed there's -> nothing to calculate)