When ever I type on my keyboard, it sometimes doesn't type or its too slow, anyone know why?

You have a key logger installed on your computer, you are being spied on. Or your computer is very old with a lot of updates on it or you have a Trojan or a virus.

u might have activated sticky keys..or batteries r not working properly.try with new a battery.....or ur keyboard is not working and got damaged...or some specific key r not working due to damaged keyboard .....or keyboard drive is by mistake deleted and there r many more problems........:D

It may be just because the computer itself is slow - like when I scroll down on a page, a lot of the time it is a bit laggy :-( and minecraft! Tha's always laggy. I have a stupid computer ;-\

you might have activated the sticky keys. just a thought