Update of several items kills my app

And if you run these same operations on mongo shell itself, it does not produce such load?

For 1 update, it goes to 4%. That is acceptable.

With and without meteor running ?

Yes


I lightened the load through this :
I removed all fields from groupObject that weren’t related to a “member_ids” field using SimpleSchema and Collection2. It dropped the load from 30-40 to 4-8%.

However this is not satisfying.

I wasn’t sure that it’s related to other posts. Now I know that it’s related to live query but I can’t use “Processing High-Velocity Time-Series Data” nor a case where I can use joins or reactive joins .