25 iOS App Performance Tips & Tricks

原文
http://www.raywenderlich.com/31166/25-ios-app-performance-tips-tricks

左岸網友翻譯，有些地方翻得怪怪的。能看原文還是看原文吧
http://blog.jobbole.com/37984/

Beginner

These are tips that you’ll always want to implement in any app you develop.

1. Use ARC to Manage Memory 
2. Use a reuseIdentifier Where Appropriate 
3. Set Views as Opaque When Possible 
4. Avoid Fat XIBs
5. Don’t Block the Main Thread 
6. Size Images to Image Views 
7. Choose the Correct Collection 
8. Enable GZIP Compression 

Intermediate

These are tips you should use when you run into slightly more complicated issues.

9. Reuse and Lazy Load Views
10. Cache, Cache, Cache 
11. Consider Drawing
12. Handle Memory Warnings 
13. Reuse Expensive Objects 
14. Use Sprite Sheets 做遊戲的話一定要知道
15. Avoid Re-Processing Data 
16. Choose the Right Data Format 
17. Set Background Images Appropriately
18. Reduce Your Web Footprint 
19. Set the Shadow Path
20. Optimize Your Table Views 
21. Choose Correct Data Storage Option

Advanced

These are tips you should use only when you’re positive they’ll fix the issue, and you feel comfortable using them.

22. Speed up Launch Time
23. Use Autorelease Pool  
24. Cache Images – Or Not 
25. Avoid Date Formatters Where Possible