KStars now supports 100 million stars!
The only trouble I have is with uploading the catalog. It’s 1.2 GB bzipped!!
The stars are the brightest 135 million from the USNO NOMAD catalog.
KStars does freeze to a good extent when zooming into Sagittarius / heavy Milky Way regions even at reasonable star densities. Probably it is worth optimizing the draw loop after all.