I think my I5 processor with 8gb RAM and SSD hard drive should handle some MT4 testing … No additional recourse is eaten then adding HTF and when it starts to SLOW.

http://prntscr.com/8zpc24 This is how it looks in testing mode, no lagging indicators insterted.
In different modeling mode there is no significant increase in speed. After closing HTF there is no increase in speed, so I guess is some bug somewhere…

Does it go fast for you with multiple timeframes? Maybe there is something wrong with my mt4 ?