If you think you may play more in the future, you can always keep the original objects on a hidden layer, only showing the bitmap copy, and the same processor free-up is achieved. May also be useful for star fields and other traditional-drawing like uses which have lots of brush work on them - when processor starts crunching create a high-resolution transparent bitmap copy of that portion, hide or delete the originals, and continue on.
Best wishes,
David
PS - your changes are fantastic! Nice WordPress work!
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