The Idea is creating a form based on from Items with relative
sizes. For some reason when you do this, performance degrades on
both design view and the actual SWF. Design view gets so slow that
I usally just close the non-responsive Flex Builder. This is
happening with Flex Builder 3 Moxie 2.
It may be the interaction between formItem and canvas, I do
know if I switch from percentage heights to a numerical value,
there is no slowdown. What do you all think? Should I post this in
the bug database?
Yes, can you please submit a bug for this and somebody at
Adobe can take a look.
Plus, if you could include all the relevant source code, that
makes it a lot easier for us to reproduce and investigate in-house.