Speed Improvements #39
Description
The site kinda slows down on local with 40 meals 50 ingredients. I think the app will scale quite a bit if we can nail these three things.
get an index on foreign keys (especially group_id)
datatables need to paginate to reduce DB load. Should be able to refer to http://railscasts.com/episodes/340-datatables
We should cache how much people owe each other if possible
first one is easy, second is doable but takes some effort, third is probably fairly complex.