Flex slow start when setting wmode

I have a drawing pad application in flex.
if I don't set any wmode, the application starts up, and the drawing is very smooth from the first "pen down".
If I set any wmode (opaque or transparent), the first "pen down" will be very very laggy, and the following drawing will be smooth.
I can also make it smooth by clicking anywhere on my application (button, empty space) first, then do my drawing after that.
Any one have an idea what's causing this initial "load"?
Thanks

Information on why the boot time is/maybe longer.
Startup - Slow Boot
Startup - Slow Boot (2)
Startup - Slow Boot (3)

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