Take the community feedback survey now.

Per Bjurström
Apr 3, 2009
  19453
(0 votes)

Optimize startup time in ASP.NET

Microsoft published a new knowledge base article on April 1st and its not a joke:

FIX: You experience very slow performance on an initial request to an ASP.NET Web site after you change the App_Code folder, the bin folder, or the Global.asax file

I installed the fix and it seem to cut down 50% of the startup time when I recompile my project. Try it out yourself and let me know if it helps.

The magic switch is optimizeCompilations=”true”.

“When it is turned on, the compilation takes a less conservative approach. If you only change the App_Code folder, the bin folder, or the Global.asax file, only the affected files are recompiled. Previously compiled pages are not recompiled.”

   1: <>compilation defaultLanguage="c#" debug="true" optimizeCompilations="true">

The Windows Vista version can be downloaded directly from here (even though the title says its for another fix).

Apr 03, 2009

Comments

Steve Celius
Steve Celius Sep 21, 2010 10:32 AM

I guess this would also apply to EPiServer 4 projects?

I'm running XP, and so want to download and install it, but looks like I have to open a support case to get the fix.

/Steve

per
per Sep 21, 2010 10:32 AM

As long as you have a .NET 2.0 project which seems to be a requirement.

You can contact Microsoft Support and ask them to mail you the fix without opening a case, I've done that with other fixes and it has not been a problem.

Steve Celius
Steve Celius Sep 21, 2010 10:32 AM

I was unable to find this hotfix for Windows 7, and I'm not sure it is even applicable or neccessary. I added the attribute to my web.config, and my site still works. It is a relatively fresh windows install, so I can't say if the performance it better, but it can't hurt (I hope).



Sep 21, 2010 10:32 AM

I am running IIS on Windows Vista x64. I tried throwing the property into my web.config WITHOUT grabbing any hotfix to see what happens, and it worked! My load times improved tremendously. I can modify code in App_Code or dependent projects, and the load time of the website is very quick, less than one second compared to 7 seconds previously.
/ Tyler Collier

Sep 21, 2010 10:32 AM

Oops, I meant to say IIS 7.

And I forgot to say thanks to Per Bjurström for the tip!
/ Tyler Collier

per
per Sep 21, 2010 10:32 AM

Cool Tyler, I guess they included it in some update then.

Please login to comment.
Latest blogs
A day in the life of an Optimizely OMVP - Introducing the beta of Opti Graph Extensions add-on

Introducing Opti Graph Extensions: Enhanced Search Management for Optimizely CMS I am excited to announce the beta release of **Opti Graph...

Graham Carr | Sep 15, 2025

Content modeling for beginners

  Introduction Learning by Doing – Optimizely Build Series  is a YouTube series where I am building  a fictional  website called  TasteTrail , food...

Ratish | Sep 14, 2025 |

A day in the life of an Optimizely OMVP - Enhancing Search Relevance with Optimizely Graph: Synonyms and Pinned Results

When building search experiences for modern digital platforms, relevance is everything. Users expect search to understand their intent, even when...

Graham Carr | Sep 14, 2025

Optimizely CMS and HTML validation message: Trailing slash on void elements has no effect and interacts badly with unquoted attribute values.

When using the W3C Markup Validation Service, some annoying information messages pop up because Optimizely CMS adds the trailing slash to...

Tomas Hensrud Gulla | Sep 14, 2025 |