External firewire 800 Iomega HD too slow since Lion Upgrade

Hi all,
Since my upgrade to OSX Lion im having the issue that my external Iomega HD is too slow to even playback my song (only audio files, About 9 Tracks of them). I removed all 3rd party plugins but the issue still occurs.
Is anyone experiencing the same issue? Any ideas on how to resolve it?
System:
iMac Middle of 2010
4GB 1333 Mhz DDR 3 Ram
External Harddrive is a iomega 1TB firewire 800 disk.
With Snow leopard it worked well... Maybe i was too fast with updating this time...
Cheers

Sorry little addition:
It s about an external fw hd working with Logic- not in general slow performance.

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Message was edited by: Just-Karma

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Ok so I decided to not go done the raid mirriring route. Instead I finally made a decision and boughts a Macpower FW800 enclousre which uses the Oxford 934 chipset and a Samsung HD103UJ 1TB Serial ATA 3.0 Gbps
buffer memory32 MB hard disk.
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I plan to buy another enclosure and 1TB disk and parition into two 500GB's also. I plan to use one of the 500GB's for Super Duper clone of iMac system hard disk and the second for cloning/backing up the scratch Final Cut space. This second disk and enclosure will be my offline backup system and will not be powered all the time.
Details of the elcousre and hard disk are provided below. I purchased them in the UK. Enclosure was purchased from www.span.com and hard disk from www.ebuyer.com. Whilst span can sell disks in the enclosure you can save yourself a little money and buy seperatly from ebuyer and install yourself.
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http://www.macpower.com.tw/products/hdd3/pleiades/pd_scombo
Hard disk:
http://www.samsung.com/global/business/hdd/productmodel.do?group=72&type=61&subt ype=63&model_cd=249&tab=fea

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