The following list summarizes the improvements made in the 2011.1 release:

• Optimized speed and memory usage.
  The control document building and rendering has been completely revised. As a result you should see significant speed improvement in both the designer and server components.
  
• Automatic Data Label Layout
  All charting types now support automatic data label layout. The data label layout prevents labels from overlapping in both ordinal and scatter charts and works in 2D and 3D appearance modes.
  
• Improved Axis Annotations
  The axes have been extended to support constant lines with texts as well as constant ranges.
  
• Axis Orientation
  All Cartesian axes now support the axis orientation feature.
  
• Improved XML Formatted Text
  The XML formatted text feature is extended to support additional XML tags that allows you to specify the text background and border.
  
• Dynamic Size
  The control size can be modified at runtime through SSRS expressions.
  
• Line and Point Series Sampling
  The Line and Point charting types support options for automatic data resampling. This allows for the visualization of very large datasets.
  
• New Charting Feature
  The Area, Line, Pie, Error Bar, Step Line, Point and Surface charting types have additional features.
  
• Additional Legend Layout Options
  Legend have additional layout options - added are the Horizontal and Vertical wrap options that allow the legend to wrap the legend items when the horizontal or vertical space allocated for it is exceeded.
  
• Aspect Control
  Chart areas have additional options that allow finer control over the chart aspect in 2D.