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aspnet-scripts.telerikstatic.com is very slow

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Kevin Cabritit
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Kevin Cabritit asked on 17 May 2011, 10:37 AM
Hi,

I am having issues with the following server for the CDN: aspnet-scripts.telerikstatic.com

See attached Firebug screengrab showing the delay.

This happens consistently, and is getting very, very frustrating.

Any ideas?

Cheers,
-alex

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Paul
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answered on 20 May 2011, 01:46 PM
I generally saw worse performance with the CDN and have now disabled the CDN. Maybe the CDN improves response time for users on another continent, but in the same continent as the web server I get better and more consistent response without the CDN.
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Simon
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answered on 23 May 2011, 11:13 AM
Hi guys,

@Alex For how long have you been experiencing this slowness? Is there any improvement? These response times are really unusual and this may be a temporary problem with the edge server from which you are getting the resources.

@Paul It depends on the Internet connection in the areas where your site is hosted and accessed. It is possible to have better response times without the CDN for those locations if the connection is really good, however, in the rest of the cases CDN will provide better response times.

Greetings,
Simon
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Kevin Cabritit
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answered on 23 May 2011, 12:33 PM
I'll monitor the response over the next few days as I'm doing some work in VS this week.

Will let you know if the problem remains.
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Kevin Cabritit
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answered on 30 May 2011, 10:32 AM
I'm still experiencing issues with this from time to time.

It's continually 'blocking'...

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Simon
Telerik team
answered on 03 Jun 2011, 05:34 PM
Hello Alex,

This is most probably an issue with the edge server, which you are hitting. As we do not have control over this and cannot fix it I suggest you disable CDN in your application.

Kind regards,
Simon
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John Harrison
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answered on 14 Nov 2011, 12:14 PM
Really? That's Telerik's official response?

Wow.
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Richard
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answered on 02 Mar 2012, 04:45 PM
CDN's are still extremely slow.  I've stumbled across several sites that also use telerik and have a noticeable pause when the scripts are downloaded.

Has the official Telerik response changed?
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Scott
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answered on 11 Apr 2012, 04:16 PM
Yes... I too am experiencing this... there is a VERY NOTICEABLE 3 - 10 second pause when loading pages that use Telerik's CDN... makes our site seem SUPER SLOW and not very responsive.. not the kind of impression we want for our users... so we'll be removing it... unless there is a fix or a faster server... We are located in Tennessee... fyi...
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Lini
Telerik team
answered on 12 Apr 2012, 07:32 AM
Hi,

The CDN servers use the DNS resolve request you make to determine your rough physical location and return the closest edge server that can handle the request. If you are using a public DNS service (e.g. Google public DNS, OpenDNS), then this resolution could take more time and take you to a server that is going to be far away and slow to respond.

Please check if you are using custom DNS server or if your ISP has had connection problems to the Amazon CloudFront CDN.

Kind regards,
Lini
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Bill O'Neil
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answered on 28 Aug 2013, 08:13 PM
Has anyone who has experienced this found any answers (other than disabling CDN?)

We have several clients who have experienced this - specifically w/ http://aspnet-scripts.telerikstatic.com - and its gotten worse over the past 2 weeks.

Disabling CDN is problematic for several reasons - and I'm hoping I can get them some information that will explain these issues...

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Marin Bratanov
Telerik team
answered on 29 Aug 2013, 12:19 PM
Hi Bill,

I am sorry to hear that some of your users are not having the best experience with the CDN provider.

We cannot, however, control the Amazon servers which are used to host it and the concrete client's network connectivity to these edge servers is what can cause issues.

What I can suggest is configuring your own CDN provider: http://www.telerik.com/help/aspnet-ajax/cdn-custom-provider.html.


Regards,
Marin Bratanov
Telerik
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Bill O'Neil
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answered on 29 Aug 2013, 01:39 PM
For what its worth - it appears aspnet-scripts.telerkstatic.com is totally unreachable today.
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Marin Bratanov
Telerik team
answered on 30 Aug 2013, 01:43 PM
Hello Bill,

I am afraid that we cannot control the Internet connectivity between two endpoints that are not in our internal network. You can contact your network administrators or ISP for assistance with troubleshooting such issues.


Regards,
Marin Bratanov
Telerik
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Bill O'Neil
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answered on 06 Sep 2013, 01:28 PM
I've found mention that the Telerik examples once used a sort of javascript/cookie base fallback for CDN (the file QsfCdnConfigurator.cs is mentioned.)  I don't see it in the current examples - was it decided that it didn't function well?  I'm wondering if a solution like that could ease the pain of some of my clients w/o abandoning the CDN entirely.
Bill
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Marin Bratanov
Telerik team
answered on 06 Sep 2013, 03:30 PM
Hello Bill,

Such a feature will require research and what I can to at this point is to log it in our database for further examination. You can use the following link to leave your comments, vote and follow its progress: http://feedback.telerik.com/Project/108/Feedback/Details/57780. I have updated your Telerik points for sharing your ideas and feedback.


Regards,
Marin Bratanov
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Gary
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answered on 09 Oct 2013, 07:57 PM
I just came across this thread as I am experiencing a similar performance issue whenever I hit the CDN. I'm really surprised that this thread which is over 2 years old is still relevant!
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Bill O'Neil
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answered on 09 Oct 2013, 08:22 PM
There is absolutely appears to be an issue more global than individual networks.  We've found that the - for many users - aspnet-scripts.telerikstatic.com hangs - even when cached.  It makes Telerik CDN almost unusable.

Haven't found a solution - either w/ Telerik or w/ individual service providers/network admins.

Bill
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Gary
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answered on 09 Oct 2013, 08:28 PM
Yeah. All the scripts are cached and it still takes an unacceptable amount of time to return a 304 response. Looks like I'm going to have to abandon the CDN. No way I can persist like this.
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Bill O'Neil
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answered on 09 Oct 2013, 08:40 PM
That's the same thing I've seen - not on my network - but on multiple client sites I've found the page hanging (waiting on telerikstatic.com) and when I look closer it LOOKS like the CDN returns a 304 but the browser just HANGS.
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Genady Sergeev
Telerik team
answered on 15 Oct 2013, 12:37 PM
Hello guys,

The CloudFront edge servers are very well connected to the internet and in general provide excellent speed around the globe. However, if it happens that you intranet goes through proxy servers or, as written earlier in this thread, if you are using a public DNS service (e.g. Google public DNS, OpenDNS), then this resolution could take more time and take you to a server that is going to be far away and slow to respond.

If this is the case it might be faster not to use CDN or use local CDN, as explained the custom CDN help article.


Regards,
Genady Sergeev
Telerik
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Allen
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answered on 08 Dec 2020, 07:06 PM

This download of the referenced aspnet-scripts.telerikstatic.com  is really slow. 

Are there any instructions for setting up local CDN using IIS Express?  Doesn't seem to resolve the Scripts and Skins folder locations. 

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Rumen
Telerik team
answered on 09 Dec 2020, 03:04 PM

Hi Allen,

To be able to configure and use a local CDN you will need to use the full-blown IIS server since it is not possible to map virtual folders in IIS Express (at least it will be far easier in IIS than in IIS Express - if you are curious why check out this StackOverflow article -> Creating virtual directories in IIS express).

You can easily install IIS on your Windows 10 dev machine by following the instruction at https://teckangaroo.com/enable-iis-windows-10/.

For your convenience, I have recorded a very detailed video showing how to configure a local (custom) CDN for skin and script resources on your IIS server.

The video also shows how to debug the resources paths in the Network tab of the browser console to make sure that they are correct.

Please follow the video and let me know if you need any further help.

Regards,
Rumen
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Kevin Cabritit
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Simon
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Kevin Cabritit
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John Harrison
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Scott
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Lini
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Bill O'Neil
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Gary
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Allen
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