Think about it this way. Say you opened each of those 4 apps 5 minutes apart. First Firefox which comes to the forefront, work for 5 min, then Word which also gains focus, work for 5 min, etc etc. Now shorten the 5 minutes to 5 seconds. No difference, just timing. If you're running into really big issues with lag and load times and have a real need, consider getting a faster rig.
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