Thanks, worked like a charm!
Side note for anyone else who is considering sminlal's process as a solution:
There is a 'Maximum Memory' option next to the 'Number of Processors' option that either was checked but not enabled (somehow?) or was checked automatically after I disabled the processors option/restarted. The max memory was set to 256MB and obviously slowed my system down very much. If this happens for you, reopen the advanced options window and disable the maximum memory!