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In OS X (both Lion and Mountain Lion), I notice that when I select text and type over it, not only does it yield the expected result of replacing that text with the typed text, it often also replaces a few characters to the right. When that happens, I notice that after the first few keystrokes, some text remains selected.

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So what is the question? This happens because the autocorrection system lags behind your typing speed, mainly due to a slow computer. – duci9y Sep 24 '12 at 6:51
It's a correctness issue, not a performance issue. If it was a lag issue, that can't explain character I type appearing on the screen while the remaining highlighted character stay highlighted and additional characters to the right also become highlighted as a result of typing. – Steve Taylor Sep 24 '12 at 10:44
That’s exactly what happened on my old Mac. It was solved by a reinstall, and a clean reinstall at that. And trust me, it’s a performance issue. I have found it mainly occurs while using Safari, though I don’t know if that’s because Safari is what I use the most. – duci9y Sep 24 '12 at 11:59
It's not a performance issue if the actual result of doing something is incorrect as opposed to just being slow. As a programmer, I'm aware of the possibility of slowness revealing an otherwise latent bug caused by a race condition. In such cases, performance isn't the prbblem; It merely reveals the problem. A reinstall won't help as I've had this problem on my mid-2011 MacBook Air since I bought it brand new. – Steve Taylor Sep 25 '12 at 3:07

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