ID:540487
 
(See the best response by DarkCampainger.)
How much lag would savefiles cause?
You're going to have to be a lot more specific. What kind of lag? Lag for whom? What are you saving, how much, and how often? Among other things.
I guess an example would be:

There is a character selection screen when you login. Some characters are locked and require an assigned var to use them. That var is rewarded to players who unlock them. So the assigned var is getting stored into a savefile the moment they achieve it.

How much lag would that cause to the client who achieved it and how much lag would that cause to the server and when would the lag occur?
Saving a few boolean variables shouldn't cause any sort of lag at all.
So what would be the things that cause the real lag from savefiles? Is that the same usual things such as possible stored icons? Like if players were to buy character icons that they could change into? Or are there certain things that could cause even more lag? Whether it affects a mob or the whole server.
Best response
If you use server-side savefiles, the only reason anyone would experience lag is if saving/loading the file is so intensive that it maxes out the server's CPU. Unless you're saving a ton of data, it shouldn't be a problem. A number of basic variables and maybe an icon or two shouldn't bog down an average server. The icons will bloat the file's size, though, and it's best to avoid saving them when possible.
Alright thanks guys I got some good information out of this, appreciate it.