[raztoki]

harddrive usage (thread title) and cpu usage are not the same;

run out of space, you can set a reserve settings > advanced settings> GeneralSettings.forcedfreespaceondisk

cpu usage in the past has been linked to https/ssl transfers (when downloading)
cpu usage could be caused by high volume of links in list, and not enough memory allocation. Java garbage collection happens in loop trying to free memory but non can be really found. Allocate more memory to fix this.