That is just another way of doing a multi time frame, but instead of having 2 separate files like in the "classical" multi time frame indicators it is done, it is using a single file which is doing the job of the 2 separate files-indicators (plus the target time frame it is called for (if it differs from the current time frame)). Usually it means that 2 instances of the same indicator are calculating a couple of bars 99.99% of time (except when first placed and when symbol or time frames are changed, and of course, it depends on the target time frame : weekly target time frame on a 1 minute chart needs to recalculate roughly 20.000 bars on each tick)
What I always suggest to metatrader users in cases when they use many indicators is to limit max number of bars on chart and, if possible, limit the number of opened charts. Max number of bars per chart of 5000 bars is more then enough for real time trading (just to remind that for example tradestation has much less than that as default) and if you are changing time frames frequently on a chart with great number of bars you can cause metatrader terminal get "short breathed".read good discussion here:
http://www.forex-tsd.com/indicators-metatrader-4/268-t3-22.html
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