This package is under development. Use at your own risk. If you run into problems, please open an issue on github.
https://github.com/helfer/minimongo-index
Minimongo-index adds simple indices to minimongo that can be defined as follows: YourCollection._collection._ensureIndex('fieldName').
To define an index on multiple fields, pass an array to ensureIndex.
Speeds up minimongo quite a bit if you have large collections, but the index is not sorted, so it doesn't speed up sorting at all. It's really just intended for indices based on object IDs.
Minimongo is used as a temporary data cache in the standard Meteor stack, to learn more about mini-databases and what they can do, see the project page on www.meteor.com