Incredibly slow firewire transfer rate

Hi fellas
my firewire drive (formatted ext3) has an incredibly slow 2MB/s transfer rate?
Is this normal? Anything I can do about it?
Cippa Lippa

I have a FireWire 400 HD, it has a JMicron chipset (pretty generic but works great). I worked wonderfully on Leopard without a single glitch ever.
Now, after upgrading to SL, I experience the same as you and the drive is not responding well, hanging constantly and experiencing really slow transfer rates, that make it unusable (all applications that try to open something from it eventually hang). It's not a temporary glitch, even after several reboots and connecting/disconnecting the drive. The same drive under USB2 (it also has USB2 interface) works perfect (but I really want my firewire back).
I hope Apple fixes it! Definitely a bug.

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