1. What’s Coming in IE8
Christian Stockwell
Microsoft Corporation

2. Who am I? … and why am I here? Program Manager on Internet Explorer.
Talk to you about some of the work going into IE8
Provide you with the context to understand our direction

3. The Big Picture Performance is about accomplishing tasks
Our goal is to make each Windows user get more done, faster
Two parts to making people more productive

4. The Big Picture Performance is about accomplishing tasks
Our goal is to make each Windows user get more done, faster
Two parts to making people more productive
Improving “Classical” performance
Use fewer CPU cycles
Use less memory

5. The Big Picture Performance is about accomplishing tasks
Our goal is to make each Windows user get more done, faster
Two parts to making people more productive
Improving “Classical” performance
Build new features that make you more productive
I’ll be talking about both of these points, and how they impact users and developers

6. More productive browsing
Browsing performance is not determined by any single subsystem
The combination of active subsystems depends heavily on what you’re doing in the browser
Consider the breakdown when navigating to the top 100 sites in IE8:

7. Caveats This data does not capture all subsystems
This analysis is only valid for IE8

8. More productive browsing
Browsing performance is not determined by any single subsystem
The combination depends heavily on what you’re doing in the browser
Consider the breakdown when navigating to the top 100 sites in IE8:
CSS
Layout
Rendering
HTML
Marshalling
DOM
Formats
JScript
Other
0.01
43.16%
27.25%
2.81%
7.34%
5.05%
8.66%
3.23%
2.49%

9. More productive browsing
Browsing performance is not determined by any single subsystem
The combination depends heavily on what you’re doing in the browser
Consider the breakdown when navigating to the top 100 sites in IE8:
Now consider opening a mail thread in a popular AJAX site:
CSS
Layout
Rendering
HTML
Marshalling
DOM
Formats
JScript
Other
0.01
43.16%
27.25%
2.81%
7.34%
5.05%
8.66%
3.23%
2.49%
CSS
Layout
Rendering
HTML
Marshalling
DOM
Formats
JScript
Other
2.40
9.41%
9.21%
1.57%
7.85%
12.44%
38.97%
14.43%
33.54%

10. More productive browsing
In IE8 we are making improvements across the subsystems
Much faster JScript engine
Unblocked script downloads
Increased connection limit
Reduced marshalling costs
Decreased memory usage
Working with 3rd party add-on developers
When introducing this slide refer to the analogy of driving down city street: The length of time it takes to get from point A to point B depends on both the speed at which you drive and the number of red lights you encounter.

11. More productive developers
Internet Explorer 8: Build better sites, faster.
When introducing this slide refer to the analogy of driving down city street: The length of time it takes to get from point A to point B depends on both the speed at which you drive and the number of red lights you encounter.

12. More productive developers
Internet Explorer 8: Build better sites, faster.
“Classical” sense:
Improve hot spots in our code to allow developers to code naturally
When introducing this slide refer to the analogy of driving down city street: The length of time it takes to get from point A to point B depends on both the speed at which you drive and the number of red lights you encounter.

13. More productive developers
Internet Explorer 8: Build better sites, faster.
“Classical” sense:
Improve hot spots in our code to allow developers to code naturally
String concatenation
Array operations
When introducing this slide refer to the analogy of driving down city street: The length of time it takes to get from point A to point B depends on both the speed at which you drive and the number of red lights you encounter.

14. More productive developers
Internet Explorer 8: Build better sites, faster.
“Classical” sense:
Improve hot spots in our code to allow developers to code naturally
Fix the “third rails” that cause performance problems for sites
When introducing this slide refer to the analogy of driving down city street: The length of time it takes to get from point A to point B depends on both the speed at which you drive and the number of red lights you encounter.

15. More productive developers
Internet Explorer 8: Build better sites, faster.
“Classical” sense:
Improve hot spots in our code to allow developers to code naturally
Fix the “third rails” that cause performance problems for sites
1x1 transparent png
Hover effects
When introducing this slide refer to the analogy of driving down city street: The length of time it takes to get from point A to point B depends on both the speed at which you drive and the number of red lights you encounter.

16. More productive developers
Overall productivity
Support key standards to reduce the need for browser-specific tweaks
Ensure that standards support does not come with a performance penalty
Building a new layout engine is hard
Remember:
CSS
Layout
Rendering
HTML
Marshalling
DOM
Formats
JScript
Other
0.01
43.16%
27.25%
2.81%
7.34%
5.05%
8.66%
3.23%
2.49%

17. More productive developers
Developer tools in Internet Explorer 8 Beta 1
Built in to minimize performance impact
Fast experimentation and debugging
Provide insight into IE behaviour
Come to my talk tomorrow for more!

18. Questions? cstock@microsoft.com
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