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The most common cause of freezing in Stellarium is insufficient memory available.
The number of star catalogues has little to do with memory usage because of the mmat loading method.
When stellarium is running check the frame rate. A good display does not require any more than 20 fps and when the display is static (no need of regular updating) a fps of 3 or 4 is quite sufficient.
You can conserve CPU activity by editing the config.ini file to set the
maximum_fps =20
and the
minimum_fps =4
in [video]
Barry
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