Flash files won't slow down the forum any more than images will depending on the files.
If you control the size of the SWF file coming in (which VB does now for images and attachments) then this is a non issue...
If the avatars are made by your users you may want to test them of course, as a somewhat knowledgeable user could code the SWF to pull in content from a remote webserver which could be a potential problem.
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