High-performance DOM scripting

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Stoyan Stefanov

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

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

Tonight: DOM is slow ,[object Object],[object Object],[object Object]

How slow?

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How bad are we talking about?

Why slow?

The bridge DOM land ECMA land

The browser

Dynatrace

Dynatrace

Speed tracer

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;

What to do about it?

10 commandments ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Etcetera ,[object Object],[object Object],[object Object],YSlow 2.0

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High-performance DOM scripting

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

2.

4.

5.

6. How bad are we talking about?

8. The bridge DOM land ECMA land

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?

15.

16.