Meteor Collections.count() too slow on UI - mongodb

Question

I have done a Simple Publish/subscribe in my meteor project and whenever User lands on home page I have to show count of total users. Users are around 15000. Now in template helper I have code written a code as,
CLIENT-SIDE
Template.voters.helpers({
voters : function() {
return voters.find({});
},
count : voterscount
});
then on SERVER-SIDE
voters = new Mongo.Collection("voters");
voterscount = function() {
return voters.find({}).count();
}
Meteor.publish('voters', function() {
return voters.find({});
});
Meteor.publish('voterscount', function() {
return voterscount;
});
The output that I receive is that the count starts from 0 to 15000 on UI Which is irritating.
I don't want rolling up of the digits on UI and should show the static count on UI as 15000 whenever page refreshed.
Why is this so slow it. In production i will have around 10 million documents in collection. This is big drawback. Any help, please?

Answer 1

This is a good use case for a universal publication, i.e. one that is automatically sent to all clients.
Server:
stats = new Mongo.collection('stats'); // define a new collection
function upsertVoterCount(){
stats.upsert('numberOfVoters',{ numberOfVoters: voters.find().count() });
}
upsertVoterCount();
Meteor.publish(null,function(){ // null name means send to all clients
return stats.find();
});
var voterCursor = voters.find();
voterCursor.observe({
added: upsertVoterCount,
removed: upsertVoterCount
});
Then on the client you can get the voter count anytime with:
var nVoters = stats.findOne('numberOfVoters').numberOfVoters;

Answer 2

SERVER-publish.js
function upsertVoterCount(){
voterscount.upsert('numberOfVoters',
{
numberOfVoters : voters.find().count()
});
}
// null name means send to all clients
Meteor.publish(null ,function() {
upsertVoterCount();
return voterscount.find();
});
var voterCursor = voters.find();
voterCursor.observe({
added: upsertVoterCount,
removed: upsertVoterCount
});
LIB-collection.js
// define a new collection
voterscount = new Mongo.Collection('voterscount');
CLIENT-home.js
Template.voter.helpers({
count : function() {
return voterscount.findOne().numberOfVoters;
}
});