Sometimes, if my iOS device (ipad or ipod touch) is acting sketchy or slow, I will bring up the multitasking bar (double-press the home button) and then remove items from that multitasking bar (do a long touch on one until they jiggle, then press the red delete spot on them.) I imagine that this is somehow saving memory or freeing up the device somehow.
But is that true? or are all those multitasking icons simple shortcuts, and deleting them has no real effect?
(bonus side question -- if it does really have no effect, what is a way to free up memory or complexity on the device other than shutting down and restarting?)