When people say that a omnline game is lagging, it used to be easy to know what they meant, they meant that there was a lot of latency between server and client, these days a lot of people outside the loop has adapted the term as a genral term of anything that affects game performance, i would like to advice everybody to use \"choppy\" or \"low FPS\" or something along those lines when describing low FPS, and using lag when describing server-client latency.
Thanks you.
The Jargon Dictionary:
lag n. [MUD, IRC; very common] When used without qualification this is synomous with netlag. Curiously, people will often complain \"I\'m really lagged\" when in fact it is their server or network connection that is lagging.
netlag n. [IRC, MUD] A condition that occurs when the delays in the IRC network or on a MUD become severe enough that servers briefly lose and then reestablish contact, causing messages to be delivered in bursts, often with delays of up to a minute. (Note that this term has nothing to do with mainstream \"jet lag\", a condition which hackers tend not to be much bothered by.) Often shortened to just `lag\'.