Is Starbucks a fast-food like coffee company? Well actually it is obvious that they are pretty fast. But to the proffessionals i ask : does Starbucks's coffee is not organic ? not healthy ? or includes so much chemicals ? I do realize it depends on the type and flavour of coffee but , anyway .. 

I , buy at least 1 cup coffee from Starbucks a day , usually Filter coffee without milk or Americano. Should I stop shopping with them ?

Basicly , I'm asking if it is unhealthy to frequently drink filter coffee(without milk) or Americano from Starbucks , like if it is real coffee or something artificial ?
As far as actual speed, that based mainly on the barista working shift, the load, and amount of available equipment.  Starbucks does not have any patented magic equipment that  lets them pull shots faster than any other coffee house (that I am aware of).  

If you enjoy their beverages, then there probably isn't any reason you shouldn't continue to drink it.  I would guess you are in the minority of people buy what amounts to black coffee from Starbucks.  Starbucks is a fairly divisive brand among most consumers.  Most of the people I have talked to that like their beverages are buying mixed drinks from them and not straight espresso, drip coffee or americanos.  

Starbucks does sell organic, fair trade and the like specialty coffees as whole bean or ground.  However, the vast majority of their beverages sold daily is likely made with whatever their "espresso" blend is.  My personal opinion is that it's horrible and over roasted.   However, it's also consistently the same tasting and consumed on a fairly mass scale daily, so if there were any inherent dangers to it, we'd likely all be aware by now.

As a brand, Starbucks is mainly aimed at consistency.  In general, that's what fast food chains strive for as well, so in that respect, they are very similar.  Proper branding ensures that you can buy a product at any of hundreds of locations (or thousands) and it will taste the same.  However, many consumers prize quality and uniqueness over consistency.  In most industries (distilling, wine, food, beer) the most expensive and "highest end products" are items that were perhaps only produced at a limited run, or were very good in a particular year.  That mindset tends to be the antithesis of the mass produced "good enough for everyone" standards that huge market brands set for themselves.  

TL;DR Summary:  Yes, Starbucks shares many characteristics with fast food companies.  The most notable aspect being their branding strategies and tactics.