Bayjax meetup turned "High-Performancer JavaScript" book party at Yahoo! HQ

1. Chapter 3: DOM Scripting Stoyan Stefanov Yahoo! Search Bayjax – April 13, 2010

3. How slow?

6. How bad are we talking about?

7. Why slow?

8. The bridge DOM land ECMA land

9. The browser

10. Dynatrace

11. Dynatrace

12. Speed tracer

13. bodystyle.color = 'red'; tmp = computed.backgroundColor; bodystyle.color = 'white'; tmp = computed.backgroundImage; bodystyle.color = 'green'; tmp = computed.backgroundAttachment; bodystyle.color = 'red'; bodystyle.color = 'white'; bodystyle.color = 'green'; tmp = computed.backgroundColor; tmp = computed.backgroundImage; tmp = computed.backgroundAttachment;

14. What to do about it?