Monthly Competition

[Goldenpigg]

is there a limit to who is eligible in monthly competitions/how are they calculated?

[Deanna48]

In addition to having a fast solve time, to qualify for the speed competition
you also have to place in the top 50 for points and have a 75% or greater completion rate.

[LLapp]

What Deanna48 said, plus you should make sure you've selected "Participate in competition" in your user profile.