Hi guys, I too am suffering slow access speeds. Although I have a SATA board I've temporarily disabled it and just running the IDE HD and optical drive which is on a single IDE interface.

From ASP:
Hitachi HDS721616PLAT80:

Capacity: 128 GB
Model: Hitachi HDS721616PLAT80
Revision: P22OA60A
Serial Number: PV2300Z2S27G7F
Removable Media: No
Detachable Drive: No
BSD Name: disk0
Protocol: ATA
Unit Number: 0
Socket Type: Internal
Low Power Polling: No
Mac OS 9 Drivers: No
Partition Map Type: MBR (Master Boot Record)
S.M.A.R.T. status: Verified
Volumes:
Leopard:
Capacity: 128 GB
Available: 98.03 GB
Writable: Yes
File System: Journaled HFS+
BSD Name: disk0s1
Mount Point: /


My xbench Disk test results are:
Disk Test 18.03
Sequential 13.82
Uncached Write 10.55 6.48 MB/sec [4K blocks]
Uncached Write 10.87 6.15 MB/sec [256K blocks]
Uncached Read 25.36 7.42 MB/sec [4K blocks]
Uncached Read 15.84 7.96 MB/sec [256K blocks]
Random 25.90
Uncached Write 15.39 1.63 MB/sec [4K blocks]
Uncached Write 19.91 6.37 MB/sec [256K blocks]
Uncached Read 85.38 0.61 MB/sec [4K blocks]
Uncached Read 36.40 6.75 MB/sec [256K blocks]

This gives me a total score of 74.68 when running the whole suite. However, if I disable Disk Test then my overall result sky rockets. Any ideas?

I think the disk speed is what's causing Leopard to feel sluggish particularly when doing disk intensive work.

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MacBook Pro 15" | Mac OS X 10.6 • 2 GHz Intel Core Duo • 2 GB DDR2-667 • ATI Radeon Mobility X1600 128 MB • 100 GB Serial-ATA
Hackintosh | Mac OS X 10.5.6 • 3 GHz AMD Athlon 64 X2 6000+ • MSI K9N AM2 • 2 GB DDR2-667 • NVIDIA GeForce 8800 GT 512 MB • ALC888 Audio • 300 GB Serial-ATA
iPhone 3G • 8 GB