I had compare crystal report and Telerik report on rendering similar dataset. (LARGE dataset)
Crystal report renders much faster on showing the initial page (viewer) by almost 50% compare to Telerik html5 viewer. (almost 10,000 pages)
Crystal report renders much faster on generating PDF file by also 50%.
Also Crystal report telling the total page on the initial rendered page., while on Telerik report (html5 viewer) it on shows pages that are already cache (and show caching progress.) It would be nice if it show the total pages then shows in the status notification the progress of caching.

Add the ability to control the relative position of text in relation to the image for both Radio & Check Boxes, such as TextImageRelation property used on your WinForms Radio & Check Boxes.
This would allow the following options: Overlay, ImageAboveText, TextAboveImage, ImageBeforeText, & TextBeforeImage.

The order of the items in the Border Style Properties should be changed such that Solid is the second item in the list, after None, as this is the most frequent option. This would allow the Border Style to be changed to Solid with a double-click.

On opening the Expression Editor, if at least one Data Source is present on the Report, then the Fields item in the tree should automatically be selected. If no Data Sources are present on the Report, then the default selection should be the Report Parameters.

The ability to use static values and display members as an array for a multi value parameter. I want my team to be able to use the standalone report designer without a custom User Function or a data source. We had been using SSRS and made a switch to Telerik, and this seems to be the only hangup that we are unable to convert cleanly.

In the standalone designer, it would be helpful if you could drag and drop the column headers to reorder.  At present you have to add a new column and delete the old one, remembering to copy all properties.

Please add a new ZoomMode to stretch the report to the viewer's visible area 

It would be useful to have tooltips to graph series  so we can explain what each Series is showing.

It's currently not possible to define in the HTML5 Report Viewer "per Report" the available Export formats. It's also not possible to alter the List in the given JS Events because the List of PDF,XLS,etc is loaded on MouseOver in the menu.

Would be great to have some kind of options, array list in the widget options to define what export formats are displayed.

Kind regards, Otto.

It would be useful to have tooltips to table header columns so we can explain what each column is showing.

Add the ability to specify rounded corners for the border of TextBoxes, Pictures, Tables and all other similar controls.

Allow custom buttons and other controls to be added to the existing ReportViewer Control Toolbar.

The Standalone Designer allows a template to be loaded from a .NET dll. Add the ability to load a template from a .NET exe.

The report Parameter as of now can only be Boolean, Date, Int, Float or String. It would be great to be able to have a Guid parameter. This is particularly useful when passing a Guid to a child report parameter that in turns needs to be a Guid again to be run in the query. As of today we must convert the Master Guid to String to be able to assign it to a parameter then the child report reconverts it into a Guid to be passed to the query

having the htmlTextBox in the report viewer is a big help when it comes to multi-formatted text, however, we also want those formatting to be applied when the user exports the report to excel worksheet instead of just plain text like what's happening now.  It's tedious breaking block of text into table cells just to apply individual formatting for each part.

When exporting a report in the format supported by the viewer, allow the user to open in addition to saving. Now they must save and then open and allowing the open option would be more efficient for the view of the report

Looks like if print in windows service will be has some problem , because print in windows service can't display the print dialog.

When trying to duplex print a report that has odd page numbers, the next report's first page prints on the back of the previous report. We need the ability to conditionally insert a page break based on whether the report's (the group's) page count is odd or even. Since we don't have access to the global pagecount variable outside the footer, there is no way to use it to insert a page break into the body of the report. This seems like it would be such a common need with the desire by many to save paper that it would be an obvious feature to include in the product. Thanks.

I have attached reports in PDF and excel format. When we export a report to excel file, the resulting excel file has extra empty rows as you can see in the attached excel file. Rows 10, 12, 15, 17, etc are extra rows. Can those rows be automatically removed and rows with data automatically expand?