Question

asp.net web application slow first time it is accessed

Asked by: PhilUnderhill8

I have an asp.net 2.0 web application that is slow to load if the application is not used for any length of time. It will take upwards of 30 seconds to load the first page. I can replicate this by re-booting the web server or trying first thing in a morning (i.e. it is an intranet app and is not used overnight). I have a getaround that fixes the problem but I am interested to know the cause (i have a batch job that runs at 07:00 each day and accesses a page).

Other information :-

1. It is not precompilation since I have tried precompiling the site and this makes no difference. Also, if I force a recompilation of the entire site on a non-precompiled version by amending the global.asax file the it will take only 8 seconds to compile the site. I have confirmed that a complete compilation has taked place by looking at the date and time stamps on the files in
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files

2. If I do an IISRESET then the first page will take about 2 seconds to load.

3. If i amend a single page the again this will take about 3 seconds to load that page. Again, I confirmed that only the pages in the same directory were re-compiled by looking at the date and time stamps on the files in C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files

4. If I recycle the default application pool the the first page will take about 2 seconds to load.

5.  IIS 6.0 on windows 2003

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Asked On
2009-10-05 at 07:13:45ID24785491
Topics

Programming for ASP.NET

,

Microsoft IIS Web Server

Participating Experts
2
Points
500
Comments
6

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Answers

 

by: strickddPosted on 2009-10-05 at 08:29:49ID: 25496166

IIS is set to automatically recycle a pool if it is not used within a certain amount of time. You can turn this off and it should take care of your daily issues. You will have have the precompiling time if you move out a new web.config, .dll, etc.

 

by: kumar754Posted on 2009-10-05 at 08:44:17ID: 25496309

if u don't want to recycle the app pool, but this might create problem in long run. the solution (getaround fix) which u have used works best in this situation. Disable the automatic recycle of App Pool and have a batch script do this for you everymorning  at 07:00, after the pool is recycled the same script will also make a call to any of your asp.net page, that will make iis to pre-compile your application after the recycle. this will make your applicaiton readily available for all users without delay.
** (I am not sure, but i guess the IIS check the timestamp for pre-compiled file if more than recent recycle time)

for you reference and manual pre-compile:
http://odetocode.com/articles/417.aspx

 

by: PhilUnderhill8Posted on 2009-10-05 at 09:00:28ID: 25496492

strickdd :
As i say recyling the app pool is not the problem because if i manually do it a page will only take about 3 seconds to load (as opposed to the 30 seconds after a re-boot)

kumar754:
when I was testing there only was only a recompile done after a change was made to a file. i.e. if an aspx file in a directory was changed then the files in that directory would be re-compiled. If a top level file that could effect all files in the directory (e.g global.aspx) then the whole site is compiled.  

 

by: kumar754Posted on 2009-10-05 at 09:13:05ID: 25496624

 

by: kumar754Posted on 2009-10-05 at 09:20:17ID: 25496700

kumar754:
when I was testing there only was only a recompile done after a change was made to a file. i.e. if an aspx file in a directory was changed then the files in that directory would be re-compiled. If a top level file that could effect all files in the directory (e.g global.aspx) then the whole site is compiled.

yes the recompile is done after you change anything inside your web applicaiton or even global.asax or web.config, to make sure for the worker process to load all the new changes and load+cache all the assemblies. this is what taking time. Either you can configure your IIS not to shutdown the worker process or instead you can increase the shutdown idle time of the worker process to few house (instead of default 20 mins) and then you can run a batch script to request the page every 1 hour.. this will make sure you application is refreshed and readily available for users.

see what best works for you !

 

by: strickddPosted on 2009-10-06 at 05:25:54ID: 25504183

Man! Kumar's answer seems a LOT like mine... just a little more indepth information about the cache...

20120131-EE-VQP-002

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