Guide we assume that whatever the maximum speed of your internet line The speed of your internet and the speed of your hard drive. Now changing this setting to a high number depends on two main things. you will see a tick box that says 'Override automatic cache size' and Source: Comment in Reddit /r/torrents post, 'uTorrent Trouble: 'Disk Overload 100%'', by user, lolibattlemech
Set uTorrent to be like this in Preferences » Advanced » Disk Cache: