Hi,
A couple of months ago our company were alerted to a Telerik security issue with 2 of the DotNet 4.5 web sites we host / support. We followed the advice and patched the dll and made some amendments in the web.config to prevent AsyncUpload functionality.
Since the patches were added the performance of both sites (on 2 different Rackspace servers) have slowed up to virtually unusable levels. No other changes have been made to the code or setup of the sites/servers as these are not actively developed due to their age (lost count how many times have we expressed a need to upgrade the sites!).
Has anyone ever experienced a similar situation or got any ideas what may have caused the issue and how to get functioning sites back?