Choppy and Laggy especially Ichat on C2D Imac with intel graphics

Last night I upgraded from 10.4.10 to leopard on my Imac C2D. Now my Imac has the integrated Intel graphics and not a fully fledged Ati but this has never been an issue before as Tiger was always nippy. I have 1.256mb ram, due to having a 1GB stick and a 256MB.
I performed an upgrade install and it all went fine. Initially though the system was very laggy and choppy, especially when using the dock, coverflow and even screensavers. Having used coverflow extensively in Itunes I can say it was never an issue before. I then decided to check out Ichat. Ichat was extremely choppy in particular with its video capture which lagged several seconds behind and even dropped frames. When I tried the effects these were about the same, no worse really and the background substitution effects worked very poorly with most of me missing.
I rebooted after installing the second wave of updates for Leopard and there was a significant increase in performance but its still choppy in places. I’m not sure if it’s due to my integrated graphics and wondered had anyone else had a similar issue, such as Macbook or Mac Mini users?
I’ve ordered a second 1GB stick from Crucial and hope this will bottom out any potential memory bottleneck but can’t help worrying it’s the Intel graphics. Would Apple seriously use Intel graphics only to release a OS which struggles with it?

In part thats a relief. I did not move over to Tiger until is was 10.4.6 to ensure stability and was always pleased with its performance. In truth Leopard works fine but graphically it does seem to have speed issues which i had put down to the GMA Intel graphics.
I really find Ichat and coverflow the worst afflicated and notice the minimal slow down I'm guessing more due to the excellent performance I had previously in Tiger.
In Ichat the video effects are terrible and the interactive rear screen fail to detect me properly. In coverflow in the finder the delay is less noticable but you can see the icons sharpen up after a second or two.
Hopefully Apple will sort this out shortly.

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Ian R. Brown wrote:
A PC friend of mine is toying with the idea of trying an iMac but is appalled by the high prices!
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Choppy and Laggy especially Ichat on C2D Imac with intel graphics

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