aspnet-scripts.telerikstatic.com is very slow

[Kevin Cabritit]

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

[Paul]

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.

[Simon]

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
the Telerik team

[Kevin Cabritit]

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.

[Kevin Cabritit]

I'm still experiencing issues with this from time to time.

It's continually 'blocking'...

[Simon]

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
the Telerik team

[John Harrison]

Really? That's Telerik's official response?

Wow.

[Richard]

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?

[Scott]

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...

[Lini]

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
the Telerik team

[Bill O'Neil]

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...

[Marin Bratanov]

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

[Bill O'Neil]

For what its worth - it appears aspnet-scripts.telerkstatic.com is totally unreachable today.

[Marin Bratanov]

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

[Bill O'Neil]

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

[Marin Bratanov]

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
Telerik

[Gary]

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!

[Bill O'Neil]

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

[Gary]

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.

[Bill O'Neil]

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.

[Genady Sergeev]

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

[Allen]

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. 

[Rumen]

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
Progress Telerik