Scrubbing audio enabled slows timeline

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When I have audio scrubbing enabled timeline scrubbing is clunky and slow. It appears to only display various frames as if I were editing an MPEG file. (I am working with AVI's.) Turning off audio scrub solves the problem. The timeline responds lightning fast displaying every frame. Can someone explain why this is?
I am fairly new to premiere. I am just wondering if it is normal or whether I have an issue that can be corrected. The other edit system I have used for years scrubbed audio without an issue. Perhaps Premiere handles the audio differently.
Intel Core2 QUAD CPU 2.5 GHz
4 Gig Ram
Nvidea 9800GT
Vista 64 Bit OS

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Turning off the "audio scrub" did eliminate part of my issue - I can now open a clip in the SOURCE monitor and scrub smoothly. However, when an in or out point is added to the clip, the scrubbing becomes very choppy. Tested the same clips in CS3 with no issues.
My machine is built for editing and far exceeds the minimum specs. Also, my clips are being stored on an internal SATA drive so it's not due to network or external drive lag. Any ideas on why this is happening? Why would it happen in CS4 but not CS3?
The issue is making it difficult/impossible to complete a project that contains hundreds of individual clips.

November 30, -0001

Scrubbing audio enabled slows timeline

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