Skill Games and Vista

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Whenever I try to log onto Skill games, my client will stop responding for a minute or two. Once I can actually control it again, once I select a game, it happens again. Once I select a game and invite a player, it happens again. During the game, every time I make a move (in chess), it happens again. Every time my opponent makes a move, it happens again.

On the 6+ PCs I've used with Microsoft XP, it has not been an issue EVER.

Why do skill games run poorly on Vista?