Weird "speed brake" on Mac Mini 2009 with Lion

Hi all,
this is bizarre: I have a Mac Mini from 2009 running Lion (with server).
For weeks (months?), it's been incredibly slow, spinning beachball of death and all.
When I look at the Disk Activity pane of Activity Monitor, for example when starting multiple applications, I peak at about 3.3 MByte/s... usually, the throughput (read or write) is no more than in the triple 100KByte/s range !
When I run Blackmagic DiskSpeedTest on the same drive, it consistently delivers around 55 MByte/s.
At first, I thought it was my Drobo slowing things down (as I can't get more than 5MByte/s out of that), so I deinstalled Drobo Dashboard completely, also removing Kernel Extensions, etc. But that wasn't the issue, apparently. Even when I eject the Drobo, performance doesn't get better.
Anyone have an idea what on earth this might be?
I would hate to have to reinstall my system, that would be a mound of work.
Thank you!
Best regards,
Hans

HDD failing? Do you have a second partition with OS X/Windows/Linux on the computer that you can run the speed tests from?
The speed may not actually be to do with the HDD, though. Speed tests sometimes are over-optimistic. It might be to do with apps running in the background, caching to disk, anything really.

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