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The Tycho 2 catalog is a good one for CdC.
Performance does not take that big of a hit, as you configure a given catalog to only be active above a given zoom level. This prevents it from selecting too many stars and overwhelming your system.
I have Tycho 2, UCAC3, and USNO-A2.0 all configured for use, as well as a custom catalog which contains the RCW objects. I can switch between them as needed by toggling them on and off via the configuration menu.
Regards,
Eric
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