I'm using the same MacBook Air model and having the same issue.
I've tried a clean install of Lion and the problem seems to remain, but I can't reproduce the problem at will, in which case that makes it difficult to show this issue to an Apple mechanic.
Have you fixed the issue? if so, how?
I haven't solved the issue. It's doing it again as I even type this reply. I strongly believe that the problem resides in the CPU or the SSD not the keyboard. The whole system freezes for about a second and resumes, creating this keyboard lag phenomenon. I will have to get it checked some day, but I think I will live with it until the warranty expiry date.
Thanks for gathering feedback guys. Since I got my MacBook Air (mid-2012 model with 8GB RAM upgrade) early July last year, it's been almost over half a year and the keyboard still has its occasional lag. It's still doing it. There's no way we can fix this I reckon. But it's not the end of the world and I don't mind the problem anymore. I love my Macbook Air and Mac OS X.
Do you all have Google Chrome installed?
I had the same issue and when I looked at Activity Monitor I was shocked at how many processes Chrome had running. None of them seemed to be using much in the way of resources - but I thought I would have a crack at removing Chrome and seeing if that made a difference.
I used AppCleaner to take Chrome out and hopefully most of its dependencies and so far - touchwood - the lag seems to have gone.
Same problem here. It's maddening. It happens once in a long while, maybe once per three weeks.
The keyboard and trackpad basically lock up and respond very slow. I can type a five letter word and get maybe one or two of the characters.
The ONLY way to keep typing the word is to slow down my typing and press one key at a time, very deliberately and slowly until that key shows up on the screen, then move to the next key.
After a few seconds, it goes back to normal. By the time I've got Activity Monitor up and running, it has gone back to normal. (Plus, if I had Activity Monitor open at the time, switching over would be difficult due to the input lag.) Checking right afterwards shows that CPU, Disk Activity, and System Memory were all within normal usage ranges--nothing was pegged at 100%.
I am running:
Mac OS X 10.8.3 (but problem happened with earlier versions of 10.8).
Macbook Air 2012
(all stock, straight from the factory)
I do not run Chrome--it is not even installed.
I've brought it in to Apple and they replaced the keyboard and trackpad and reformatted my system drive, but that didn't fix it. In fact, the problem happened not too long afterward, even before I had installed most of my software back on the system.
It seems to happen the most in Apple Mail, although that may be because that's really the only software I do the most typing in.
I suspected that it might be the aggressive spell correction features in Lion and Apple Mail fighting each other, but I've turned off the auto correct as much as possible and the problem still occurs.
Anybody got any news on this issue? I can't bring the Macbook Air back in for service without being able to reproduce the problem consistently.
I did a little more digging and noticed that I had a lot of errors in my console log like this:
sandboxd: () mdworker(5926) deny mach-lookup com.apple.ls.boxd
They seemed to happen at roughly the same time I was getting the keyboard/trackpad lag.
Googling it turned up this article which mentions freezes of about four seconds plus a solution that worked for me to remove the errors:
Note though that even though the errors are no longer showing up in my console log, I don't really know if the keyboard/trackpad lag has been fixed, since it happens so rarely. It might take a month or so before I'll really be sure this was the fix.
But I'm sharing it here in case it helps somebody else. It is too much of a coincidence that they were also experiencing short freezes of a few seconds.