test dynamics crm form load time

Hello,

I have to test website loading time. I am using test project in Visual Studio 2010. I am testing Dynamics CRM with a lot of JavaScript onLoad code. I was trying web performance test but it executes only HTTP requestes and JavaScript is not tested. Right now I am trying to use Coded UI test. I have recorded actions opening form and closing window but when I perform load test which repeats the test e.g. 10 times I can see that sometimes there are few seconds gap beetwen the form is loaded and closed. That makes the test useless. Is there any way to use some kind of wait condition in test? I would need a test with actions like this:
1. Open form
2. Wait till a 'field' is set to 'value'
3. Close window?

Is it possible?

Thanks in advance.

Regards,