Nice work NerdFencer.
I agree with you,
it is safe but the space that you temporarily save is insignificant,
and the decrease in performance is noticeable.
When you have a 3,200 mhz machine with a gig of ram, you just don't care if it takes longer, since "longer" is still short anyway.
In addition, deleting PF files could have a very positive affect.
Ever wondered what happens on malware infested machines that have been cleaned of malware, & windows still tries to load non-existent malware entries on startup which slows things down?
Think about the bright side of this!