Im trying to re-index the blockchain to avoid having to download it again (slow connection).

Its taking days. Im using Linux and the processor use is under 10%!
Does anyone know how to increase that? I've adjusted the DBcache size up very high and tried out using the Error check threads that are available in options and when I launch Bt caore it runs at 50% for a while and gradually slows down to under 10%.

Does anyone have any tips to speed this up? Surely it should be at 50% more or less all the time? !00% would be great.
The disk use isnt very high either.