f15 sync slow after couple of days

[Rich Emberson]

When I first start my machine,  a sync takes less than  a second
and compiling a small Java project takse 34 seconds.

After running for two days, a sync takes 25 to 30 seconds (and running
sync just after a sync still takes that long)
and compiling the same Java project takes 5 to 8 minutes.

Where do I look to try and find out what is slowing stuff down?

I've got 1 500M, 2 1T and 1 2T disks on the system.

Thanks
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