How much of a strain on servers is jQuery?
I haven't used jQuery yet, but one can't help but notice the plethora of questions that involve it.  In reading about the basics, [some][1] mention a "strain on the client computer and maybe your web server as well if you intend to host the JQuery script on your own web server".  

I am not so much concerned about client-side, but wonder what kind of strain we would be looking at.  I [read][2] that the jQuery library "can be included within a web page by linking to a local copy, or to one of the many copies available from public servers".  I wonder why Microsoft (or whoever) would want millions of people using their servers to DL jQuery libraries? Does the client DL the file all at once with each session, or are just the parts needed DL'd and accessed locally when events/effects/functions fire?  How often is the library purged client-side?  If I had, say 100'000 visitors and 1'000'000 hits on my site, how many times would the library file be DL'd? Once per session?  Sorry for posing this n00b question, but I am reading some conflicting things, and wonder if someone could fill me in.  


  [1]: http://www.jscripters.com/jquery-disadvantages-and-advantages/
  [2]: http://en.wikipedia.org/wiki/JQuery#Including_the_library
How much of a strain on servers is jQuery?
===

I haven't used jQuery yet, but one can't help but notice the plethora of questions that involve it.  In reading about the basics, [some][1] mention a "strain on the client computer and maybe your web server as well if you intend to host the JQuery script on your own web server".  

I am not so much concerned about client-side, but wonder what kind of strain we would be looking at.  I [read][2] that the jQuery library "can be included within a web page by linking to a local copy, or to one of the many copies available from public servers".  I wonder why Microsoft (or whoever) would want millions of people using their servers to DL jQuery libraries? Does the client DL the file all at once with each session, or are just the parts needed DL'd and accessed locally when events/effects/functions fire?  How often is the library purged client-side?  If I had, say 100'000 visitors and 1'000'000 hits on my site, how many times would the library file be DL'd? Once per session?  Sorry for posing this n00b question, but I am reading some conflicting things, and wonder if someone could fill me in.  


  [1]: http://www.jscripters.com/jquery-disadvantages-and-advantages/
  [2]: http://en.wikipedia.org/wiki/JQuery#Including_the_library