Is it possible to reduce the number of HTTP calls when using a ReportViewer control?

My application is written in .Net 4 using Visual Studio 2010 (version 10 of the ReportViewer control). The report in question contains a lot of data in the dropdowns used for parameter selection. For example, one dropdown contains 95k options and another
uses 24k options (I know this is bad design, but we need to keep it as-is for this release). When I use Fiddler to profile the report, I see that it makes a lot of HTTP calls and a majority return the same dataset. There are three phases of loading data. Each
one initiates a series of HTTP calls.
Loading the initial header with the filter controls (dropdowns, textboxes, etc).
Changing one of the dropdowns that has a dependent dropdown (start date/end date)
Loading the final report after clicking the View Report button
In total, 13 HTTP calls are made and 10 of those are returning the same 10MB of data. The final report only returns 13 records, but the whole process of loading the report filters, changing report filters and loading the report require 130MB of data to be
exchanged. This is an extreme example, but we do have other reports that are doing the same with smaller amounts of data.
My question: is there any way to modify the ReportViewer or the SSRS server to reduce the number of calls? Is this related to ViewState? Please understand that I am new to Reporting Services and have a lot to learn.

Hi rodeofive,
As per my understanding, the issue is a performance issue. And it is caused by there are thousands of values in the drop-down list of parameters in the report.
To work around this issue, I suggest you should make some changes in the report. For example, we can add additional two parameters with multiple keywords ahead, one for the dropdown contains 95k options, another for dropdown contains 24k options. Then all
of available values which are begin with the keywords will display in the parameter list. In this scenario, we can create cascading parameters. One is a keyword parameter, and the other parameter is the drop-down list that based on the keyword to display the
available values.
For more details about the method, please refer to the following FAQ:
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/8de6c783-9cb4-4b95-9be8-b59bc0049866/forum-faqhow-do-i-add-a-search-feature-in-the-parameter-with-long-drop-down-list?forum=sqlreportingservices#8de6c783-9cb4-4b95-9be8-b59bc0049866
Hope this helps.
Thanks,
Katherine Xiong
Katherine Xiong
TechNet Community Support

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