Z-mongo-admin, the Meteor equivalent of phpMyAdmin, was a project that won a prize at the Meteor hackathon earlier this year. [1] Here's one of its authors, Geoffrey Vedernikoff, speaking at HackMIT. [2] Perhaps you could compare notes with the team to see what's going wrong in your version.
Speaking as the author of Z Mongo Admin, it's mainly because we haven't implemented pagination yet. Can't be too hard to add {limit: 20} to the queries though.
[1] http://www.meteor.com/blog/2013/07/09/congratulations-to-the...
[2] http://www.meteor.com/blog/2013/10/11/meteor-at-hackmit-onet...