Using additional monitor with iMac 17" Core Duo.. SLOWDOWN

I bought the mini-dvi to vga adapter to connect my IBM 21" CRT to my iMac for dual display purposes. It works and all, but whenever it's connected my mac slows down to a crawl. I thought originally it was a RAM issue, but once I upgraded to 1GB the result was the same.
Is anyone else noticing this, or have any solutions?
It does this in both extended and mirror mode, btw. I'm using OS X 10.4.6.

After messing around with the settings for a while, it seems that the problem goes away if both monitors are set the same refresh rate. I set my CRT to 60Hz and I don't see the slowdown yet.
This probably is only a problem if you're using a CRT, since LCDs all generally use 60Hz.

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Welcome, Selia!
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bonjour,
jespere que vous comprenez le francais
j'ai un imac intel core duo 2ghz, 1go de ram dd2 osx 10,4,9
j'ai un soucis quand je joue a world of warcraft, l'ecran se brouille, ne nombreux traits apparaissent, impossible de voir en fait le jeu correctement, obligé de faire un pomme+m et de revenir en full screen apres, et ca repart.
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je n'est pas eut le temps d'essayer d'autres jeux.
je n'est pas essayer en redemarrant sous windobe.
l'ordinateur est encore sous garantie.
dites moi tout ce que vous savez
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a bientot.

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