My advice would be: Cache everything you can, especially expensive code sections. Move everything that doesn't have to update immediately to cron jobs. Whene

My advice would be: Cache everything you can, especially expensive code sections. Move everything that doesn't have to update immediately to cron jobs. Whenever you can, load information on demand. Try to think before-hand about the nature of your app, specifically, is it write heavy, read heavy or code heavy? Map out a scenario of what you need to scale first, and what isn't as important to scale, for example, would you need more app servers or db servers? Load balance if at all possible.