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Type: Suggestion
ID: 442587
Opened: 5/6/2009 1:35:09 AM
Access Restriction: Public
1
Workaround(s)
In IE8 the JavaScript engine was improved, but it still lacks performance.
Sites with many AJAX components can be get running slow in IE, but in other browsers (Firefox or Google Chrome) they run very fast.

As developer I recognized this when using ASP.Net AJAX and Grids in UpdatePanels.
Updating large grids is very slow in IE.

MSDN Support in Germany told me this is because the IE allows Microsoft customers to plug in their own JavaScript Engine.
I suggest to deploy a special IE version for these customers. General public should use IE with the Microsoft JavaScript Engine, which should run really faster without the plugin model.
Details (expand)

Review Status. Please select No.
The IE Team will update this status to Yes once we have reviewed this report.
Yes

1. Please verify that you are using Internet Explorer 8.
Yes, I am using Internet Explorer 8.

2. What is the goal you’re trying to accomplish?  You can put this in an “I want to…” statement or a statement about the end result (e.g., “Fill out online forms with no spelling errors”). If necessary, please include any URL’s.
I want to run complex AJAX sites fast in IE.

3. Can you accomplish your goal in another way? If so, please describe the steps otherwise put “Cannot accomplish with IE8”.
Cannot accomplish with IE8.

4. What part of internet explorer are you working with when trying to accomplish your goal?
---AJAX & Cross Document Messaging

5. What do you consider the priority of implementing this scenario?
1 = This scenario should be high priority but I can live with the current implementation.

6. Why did you give this scenario the priority you did?
The low JavaScript performance ony sometimes induces a browser crash. Mostoften users have just to wait.
But this problem is not low priority because users get to know other browsers are running much faster on such sites. This is not good marketing for IE.
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Posted by detective conan on 5/15/2009 at 11:22 PM
I agree. Just focus on performance in IE9.
Posted by CH121 on 9/30/2009 at 6:22 AM
I also would love to see some serious performance enhancements on the javascript engine. As developers we are using AJAX and other Javascript functions more than ever before.
Posted by Kman18 on 10/23/2009 at 11:49 AM
I completely agree. IE's javascript performance is very poor. Technology is gearing more towards a lot of client side scripting. This should be a main concern for the next version of IE.
Posted by Chris J Smith on 11/1/2009 at 11:59 AM
Agreed.

Could managed JScript be rewritten using the DLR and integrated in IE9? That would give the instant performance thanks to the JIT and be in line with Microsoft's .Net strategy.

I have no problems with the IE8 rendering engine - it's cool.
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