For the 12 hour charts, you have samples every 40 seconds for 12 hours that is 1080 samples on a chart, which the browser has to shuffle down each time there is a new sample. If the five charts are on the same tab then that is 5,000 samples to shuffle down, though I would not have thought an i5 would have great difficulty with that. I am not sure what the situation is if they are not on the same tab.
However, for the 12 day charts, unless you are downsampling the data, that is 24,000 samples for each line, so a total of 72,000 samples, which is pretty heavy duty.
To confirm whether the charts are the problem then disable those flows and see if it is ok. If it is them then the solution is to downsample the data to reduce the number of points on the charts. There is no point drawing 24000 points on a chart which is presumably only hundreds of pixels across.
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