On 2013 Dec 28, at 15:14, Eric Wing <ewmail...@gmail.com> wrote:

> 1) I figured out that the bottleneck was in scrollRangeToVisible call.

You could see if you have better luck with -[NSView scrollPoint:].

> 2) -[NSBigMutableString replaceCharactersInRange:withString:]: nil argument

Well, there’s the obvious answer that your other code is passing nil for 
withString:.  You could check for that.


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