I noticed my app was running slowly on a Heroku 1x dyno with 512mb of ram. Turns out I was over the memory quota and into swap space. My app has been using 500-900mb of memory.
If I make an empty app and run meteor --production it seems to use ~320mb of ram.
Is this typical memory usage for a complex Meteor 1.3 app? What kind of memory usage do you see in your apps?