Comment 7 for bug 1402188

Actually for my example, mag9.9 comets will be shown in a sky showing mag 8 stars. Indeed, hints for mag11 comets are not drawn here. Do you want to have hints for mag15 objects in a 60°FOV mag6 sky? Then we can just increase the limit, but then we may again have a problem with too many dim comets slowing down fps. We can have hundreds of comets computed in the background when we only display what's visible "and slightly more".

I just tested loading all MPC comets and displaying without this early-out test, and with a mag difference of 8. The latter is acceptable, without the test frame rate dropped too much IMHO. Or maybe introduce two more config variables, astro/comets_hints_magdiff(default 5?), and astro/planets_hints_magdiff (default 3?), that can be adjusted to the computer's CPU power?