Originally Posted by hawaiitaco
I think you're talking about network lag. 200ms input lag would be near impossible to play with.
Yeah, I think you're right. The difference:
With 200 ms of input lag, your character wouldn't move (or jump or shoot, etc) until 2/10s of a second after you press a button. And then he wouldn't stop moving until 2/10s of a second after you stopped pressing the button.
With 200 ms of network lag, your game will predict what will happen over the next 2/10s of a second and then adjust once it receives the "truth data" from the server. This accounts for some people walking in a straight line only to teleport to a completely different place in the game world, because they didn't actually move the way your client predicted they would.
Input lag, controller lag, network lag... these are all going to stack. So don't make the mistake of thinking, "I'm already playing with 200 ms of network lag", so the 100 ms input lag on the projector or the 50 ms lag on the controller won't be noticeable. It means you'll have something like 350 ms (3.5/10s of a second) lag. If it takes 200 ms to get the data to your client, and then it takes 100 ms for you to see it- you react, but it takes 50 ms for your client to read the controller... and then another 100 ms for you to see the result... Well, it's not good.