How do games speed up and slow down?

[adeyke]

There have been a couple of games recently that have seemed to go faster than usual.  One single player, on multi.  Is there anythign that could happen to speed up games to watcdh out for?

By speed up, I mean monsters go faster, attacks seem to happe nfaster, and things seem to run faster.
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Sometimes when you lag out, it speeds up to catch up to where you should be.