How do games speed up and slow down?

[Yogi_Baar]

That explains the multiplayer, as another person in the game was complaining about lag.  Just need to figure out single player now.

Edit after some playing: Now that I remember and play a little, it did happen after slows in single player games as well mostly.
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Multishot Shenk is your best bet, I suppose (if that creature can be run on single player). His extra fireworks usually mean one graphic update per two to three seconds on my machine. Lovely stuff.