Sigh, where do you get the information that I have 1 core?
As I wrote in the first post, I have a Core 2 Duo E8500 and 4gb ram. I even linked a cpuz output file in my previous post with detailed info.
My comp specs are more than enough to run mIRC.
I ran xp32 until a week ago and mIRC never used more than 5-15% cpu and it never locked up when scrolling or selecting text. I've been running xp64 for about a week now, fully updated and legal version.
The hardware is unchanged.
The mIRC install is unchanged.
The only change is using xp64 instead of xp32.
It's pretty difficult not to point towards mIRC having problems when run in a 64bit environment.
If I was really bored I could install xp32 again, just to prove my point. But I doubt that would change anything.
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One thing I noticed is that when I change to a channel the text flickers a lot for about half a second, as if the text is being formatted/parsed/whatever multiple times.
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Once again I urge you to be more specific since your current attempts at helping are rather fruitless. What is "something else" that could cause this problem?