Need an expert in Meteor.js - My webiste is slow because it load everything on all pages with meteor

Hello,
My website is very slow, it load eveything on every page.
We use Meteor.js, I think it is a problem with miro:preloader, numtel:lazy-bundles something like that.
Blaze for the front end et iron router.
I really need an expert in Meteor for repar the speed of the website and for make a lot new things inside