OSX 10.7.5 Finder unresponsive when using firewire 800 devices

My system was running well until recently when my finder in OSX 10.7.5 has beccome intermittently unresponsive. Many apps, especially Mail are not very responsive either.
I have multiple external hard drives (both 400 and 800) hooked into a Nitro AV firewire 800 hub repeater. When I pull the firewire 800 cable from the port on my Intel iMac, the system and finder seem to work properly. When using a single device plugged into the iMac's FW 800 port, the system and finder also appear to run fine.
Other symptoms include drive icons not ejecting and freezing on the desktop, system crashing often, very slow startup, apps running slowly at times and becoming unresponsive during use, slow opening of folders and slow launching of apps.
If anyone has had similar problems or has any experience with these issues, I would be grateful for your help.
Thanks!!

I read another thread about the same problem and it is checked under Finder>Preferences.  All boxes except Macbook Pro are checked.

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