ffp fast but records history i don't want

Firefox portable is running smoothly on any machine I've tried it on, even older machines. Especially with all kinds of storing features unchecked and checking the boxes to erase all cookies on browser close. With any other options checked it does tend to be somewhat slow on closing and opening, especially when the numbers of cookies have been increasing.

One problem that's still remaining even under this tighter, faster performance is that histories are being saved evne though there is not one history-related checkbox checked. I don't want it saving histories because I want to keep from writing to my flash drive as much as I can, just to prolong the lifetime. Why won't it stop keeping histories? Nothing's checked!