Quote from fullautotrading:
tick by tick is perfectly doable, even with several dozen instruments simultaneously and an ordinary home connection and with decent pcs. Especially if you confine yourself to price action and straigthforward computations. (Clearly, must use the right tools: do not expect to use excel!) Most indicators are good for "descriptive" purpose only ("prevision of the past"), anyway, and are of no value whatsoever, when it comes to trading.
Tom
Yes, tick by tick is doable, on home connection and other. But the reason to use tick by tick is to be able to react at close speed. If you are not physically close to the action (exchange), tick by tick doesn't matter much. Yes, forget about excel. Indicators, too.