Cost of cache from glitter icons?

[sd_muma]

On a Board such as Invision, is it possible to determine the cache "cost" from the glitter signature junk such as is popular with My Space? For users with dial-up modems (and there are still those around) these take forever to load. Restrictions may be in order, but what would be a good "limit"?

 

[Mictlantecuhtli]

No images would be a good limit, no signatures at all would be even better (that's how I've set my forum view).