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Conference Notes and Best Practices, Release 1.3 • Compress images/Cache • Image sprites/logos/icons Resource Order • Load first styles in critical path • Place JS after other resources, ideally at the end of the file. • Inline some CSS at the top. • Lazy loading (Load images/assets only if the user gets there) Assets CDNS • Geographically serve assets • Improve load time Improve Backend • SQL Queries • Use “values_list” • Verify same queries aren’t running multiple times • Select_related and prefetch_related Select Related and Prefetch Related • Get foreign keys • If getting foreign keys use select_related • Prefetch related can work for many to many queries Cache • How should I cache? • Memcache • Use low level cache? Low Level • Flexibility • Reduce lookups • get() set() delete() methods • Flexibilty to develop your own cache scheme • Template fragment cache • Can accept context variables • example (Get cache template for different users) 22 Chapter 3. Conferences
Conference Notes and Best Practices, Release 1.3 Per Site Cache • Great for heavy read sites • Not really approprate for immediate change sites • Difficult to delete cache backend • Google analytics can have issues Cache Frameworks • Johnny Cache • Cache Machine • ORM Model cacheing CDNs • Browsers support 6 connections per hostname • More maximum connections • Hashring with CDN domains • Each domain is a seperate DNS lookup. • Limit what you need to do inside of a request. • Defer Job Queue • Process queues off line • Requires more configuration Server Level • Set expires header • Cache control headers • Gzip responses More Requests Less Money Presenter: Nick Catalano Track: I Description: Hear how in under 2 weeks Ain’t it Cool News, a movie news and review website with over 15 years of raw HTML content and hundreds of thousands of daily visits, was moved from an expensive custom Ruby on Rails App on an EC2 cluster to a dedicated server running Django. All with zero downtime. 3.1. Django Con US 2013 23
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