Also,  the provided project has the WebGrid's AutoFitColumn's property set to true. As I said in the original post, this is the setting that doesn't show the bug.  In the modified version above, this property is set to false causing the page's load time to exceed nearly 25 seconds but only 5-6 seconds when set to  true.

I am still not sure how the WebGrid is related but there is definately a performance issue there.

I am doing more analysis.  I removed some of the WebPaneManager from the page's MasterPage and there is a dramatic performance increase.

Let's direct attention to the WebPaneManager. How would this be connected to the WebGrid's AutoFitColumns? Was there any changes to the WebPaneManager for 2009?

I opened your sample and modified my sample with using WebPane manager  and WebGrid settings you had. Unfortunately, it runs well in here. I sent you my modified sample. Maybe some styles affected the performance.

Regards,
Handy

This shouldn't be caused by CSS unless there are some major problems.

I did more analysis and found major performance issues that are related to the WebPaneManager control and the WebGrid control's AutoColumnFit property. Returning the application to the previous 2008 R2 version brought back the performance to an acceptable measure.

Please review the data below that clearly shows a major performance problems that trend from page to page. One page goes from 1 minute to 15 seconds just by changing that AutoColumnFit property. That should be a major major concern.

1) Was there any changes to the WebPaneManager control and the WebGrid control's AutoColumnFit property from 2008 R2 to the 2009 R1 SP1 version that could have caused this?

2) Did you try running the page I provided you? If so, what was the load time? Did you notice a similiar difference in performance if you remove the WebPaneManager control and change the WebGrid control's AutoColumnFit property to "true"?

3) In your test with the NorthWind database with over 2000 records, how long does the page take to render with the WebGrid control's AutoColumnFit property set to true and false?

4) What version of WebDesktop and WebGrid are you using?

4) Has anyone else mentioned any performance issues with the 2009 R1 SP1 release?

I performed more analysis and found some dramatic performance issues. If you remove the WebPaneManager on the page, the load time changes from 30 seconds to 6 seconds.

I am not sure if these issues are related but I am very concerned. Please advise on what is going on.

I tested out with Invoices table on Northwind database which has 2188 records (4 times larger than you used). While my setting also used AutoFitColumns, the page never loaded until 1 minute or over. So, perhaps there still some settings on your WebGrid structure. Could you send a simple sample (runable) that replicates the issue (use northwind database)? Or at least, you can share about your WebGrid settings.

Regards,
Handy

I don't quite understand your results. Are you saying it took 1 minute or more?

Also, the bug is when the AutoFitColumns is not used (AutoFitColumns="false"). 

I checked the 2009 R1 SP1 release notes and didn't notice any reference to AutoFitColumns but something must have changed.

I've uploaded one of the slow pages that takes 10 seconds to load when AutoFitColumns=true and 30 seconds to load when AutoFitColumns=false for you to reference.