As far as I know, meteor reactivity listen to mongo oplog to make the magic of reactivity work.
Is there a parameter (in milliseconds probably) to listen less frequently in order to reduce the load on server ?
now what you are asking but this can reduce the load on the db - check redis oplog
@rjdavid’s answer is a very good solution. However, if you lack the time / resources to get a Redis instance, you could turn off the Oplog tailing and instead use polling, with a set interval. Very good info in this official blog post about tuning Meteor Mongo Livedata.
Thanks a lot to both of you. I will explore this.