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When CRM2011 UR 12 (POLARIS) introduced asynchronous loading of web resources, there were some unfortunate side effects caused by the load order in which the scripts were executed not being the same as defined by form customisations. If you had scripts that required a previous scripts to be loaded first before it could be executed, you would experience random script errors due to the unpredictable load order. You can read more about the issue in the MSDN forums thread and the blog post I wrote explaining the behaviour and workaround.
Since then, the behaviour has been reverted back to the pre-UR12 loading technique as of Dynamics CRM2011 UR15 but this post describes what you can expect from Dynamics CRM 2013's script loading mechanism.
One by-product of this dynamic loading of scripts is that you won't see your web resources in the list of scripts using the F12 debugger since the browser has no <SCRIPT> tag to get the URL from. The script will still be available for debugging; however it will appear as an anonymous script block rather than in the list of script sources against its web resource URL. The technique I describe in the 'New Project' SparkleXrm tutorial of using www.fiddler2.com to create a re-direct to a script on the disk will still work because the browser request the web resource by its URL, allowing fiddler to intercept and redirect. Caching behaviour is unchanged with the web resources being cached by the client until customisations are published and the cache version is changed. You can read more about this mechanism in my web resource caching blog post on the subject.
The good news is that as a result of the changes – forms are noticeable faster to load.
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