MacOS – Impossible to key-press three near keys

My main answer:

Apple deems this a feature, as documented in their knowledge base. Apple does not document how to disable the delay.

In my experience, if you remap the caps-lock key on Mac OS X (in System Preferences .. Keyboard .. Modifier Keys), and e.g. map it to Control, then the delay goes away while I am logged into Mac OS X. So as koiyu suggests in the comments here, it seems like there is some variation available between the hardware and the keyboard driver.

Remaining questions:

My own problem is that the delay remains when I boot into Ubuntu Linux, and in that context, even when I remap the Caps Lock key to Control, the delay is still present. So the vanilla keyboard driver provided on Ubuntu Linux still suffers from the delay.

So my questions at this point:

• How is it that the standard Windows 7 driver has no delay and the Linux driver does have the delay?

• How can one replicate disabling the delay in the context of a Linux installation atop the laptop?

I think this is a bug in Mac OS X and has something to do with the way the keyboard shortcuts for Spaces are processed. Try this:

• Make sure Spaces is turned on in the System Preferences with the standard 4 spaces layout, and standard key combination for switching to a space.
• Open a folder in the Finder.
• Press and hold CTRL, and press any of the number keys. If you press 5, 6, 7, 8, 9 or 0 first you will get a beep. Same if you press one of those keys again (still holding CTRL). If you then press 1, 2, 3 or 4, you will switch to that space number; or just stay in that space if you were already in it. If you then press any of 5, 6, 7, 8, 9 or 0 again, it won't beep anymore.

If you simply turn off Spaces, the above won't happen and whatever order you press the keys in, they will continue to beep. If you change the number of spaces to only two, then 3, 4, 5, 6, 7, 8, 9 and 0 will give you a beep until you've pressed either 1 or 2. I don't know of an application in which those keys have a non-Spaces functionality and would do something useful other than beep, so I haven't been able to try what happens in such an application. In any case, I don't think you need to worry there's something wrong with your keyboard or the way you've configured the keyboard bindings; it seems to be a bug in Mac OS X.

Edit: Try the above in a new folder in which you've created folders named "1", "2" and so on. I find the Finder's behavior in this case somewhat strange: if you press CTRL-8, it will beep yet also switch the selection to the folder named "8". But again, pressing 5 through 9 will neither beep, nor change the selected folder once you've pressed any of 1 through 4.