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Is this "input lag" or something else?

post #1 of 3
Thread Starter 
I've been having this stubborn problem for years now. Happens on all 3 of my rigs (2 AMD, 1 Intel).

Basically what happens is that I experience a very slight delay between the time I press the button and when the game actually registers it. It's not a problem in casual single player games but I mostly play really competitive and fast paced games which require PRECISE timing (Quake 3, Quake Live, cs 1.6, Dota/HoN, beatmania and fighting games). This problem is especially noticable in beatmania (rhythm game) or fighting games. No matter how good I time it, it keeps missing the majority of the times. The sound that I hear doesn't seem to match with what's happening on the screen. When I press a button, I can hear the sound go off immediately but my action doesn't take place until 1/4 of a second later

All of my testing is done OFFLINE so lag is out of the question. Just for the record, it's much worse ONLINE. I googled a bit on "input lag" and this sounds like it might be it but I need some confirmation perhaps from people who have experienced it first hand.

Video/chipset drivers acare new, mouse @ 500hz, no viruses/spyware, vsync is OFF, pre-rendered frames is at 0-3, fps is maxed out on these old games.
Edited by woodyfly - 2/27/11 at 12:37am
My System
(14 items)
 
  
CPUMotherboardGraphicsRAM
i5 3750k @ 4.3 MSI P67A-GD65 Sapphire 7850 OC edition 8gb  
Hard DriveCoolingOSMonitor
1gb sata hyper 212+ win 7 samsung 21' 
PowerCaseMouse
620w Antec Neo Eco NZXT Evo Tempest abyssus 
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My System
(14 items)
 
  
CPUMotherboardGraphicsRAM
i5 3750k @ 4.3 MSI P67A-GD65 Sapphire 7850 OC edition 8gb  
Hard DriveCoolingOSMonitor
1gb sata hyper 212+ win 7 samsung 21' 
PowerCaseMouse
620w Antec Neo Eco NZXT Evo Tempest abyssus 
  hide details  
Reply
post #2 of 3
An informative article on input lag:
http://www.anandtech.com/show/2803/7
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7-920 Msi Pro-e GTX 580 6GB 
OSPowerCaseMouse
W7 x64 Corsair TX750 Antec 300 Logitech OEM FTW 
Mouse Pad
wat? 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7-920 Msi Pro-e GTX 580 6GB 
OSPowerCaseMouse
W7 x64 Corsair TX750 Antec 300 Logitech OEM FTW 
Mouse Pad
wat? 
  hide details  
Reply
post #3 of 3
It certainly sounds like input lag, do you have a CRT monitor to test on? Also is your mouse/mice wireless or wired?

The "proper" way to test for input lag is to hook up 2 monitors to your PC, a LCD and a CRT. CRTs basically don't have input lag so you can treat that as the best you can get. After cloning the displays, you then run a stopwatch program (i.e. one on this site), take some photos and look at the time difference.

The time difference you get between the LCD and CRT is how much input lag there is. Further instructions on that method here.

If you're using a wireless mouse and also have a wired one, you can try out this Human Reaction test. Do the test a few times on both mice and if you final time is massively different between them (usually wireless will be slower) then it could be input lag caused by your mouse. Although from the sound of it, you're getting input lag when using your keyboard as well, so it could be something else entirely.
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