I upgraded to KDE 4.4 the other day and enabled the Strigi desktop indexing for the first time. As a result, my computer has been churning for over 3 days now. It doesn't completely peg the CPU, but it takes a whole chuck.
I don't know if it's the Strigi indexer, or the Virtuooso backend (version 6.1) or something in Nepomuk for KDE 4.4. But this is ridiculous. I haven't used my computer much in the last couple of days, so I just let it go, thinking that eventually it would finish indexing or something.
But no, it's still slowing down the whole desktop. This is on an AMD X2 64-bit dual-core 2.1 GHz processor. I guess I'll stop it here at some point and just disable file indexing again.