Three points.
1. I'm running Xara 5 on Windows 64-bit with no problems, so it's at least possible on some configurations.
2. Try the thread settings mentioned in this discussion
http://www.talkgraphics.com/showthre...me-Pro-5-Laggy
3. I've found Xara 5 interacts poorly with certain 3rd party software, such as clipboard managers. It might be something else on your system messing with it.
~Jesse
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