With Internet Explorer 11, you get a robust graphics stack with foundational WebGL support, high DPI advancements, significant performance improvements, and additional Canvas capabilities.
For more info, see "Canvas enhancements".
Because they use multiple intermediate textures, Canvas effects like shadows and composite operations, SVG filter effects, and CSS box shadows and text shadows are heavily resource-intensive. IE11 and leverage changes made to the DirectImage batching behavior in Windows 8.1 to more effectively coalesce Direct3D Draw calls and minimize device state changes. This change improves performance for Canvas, SVG, and CSS effects, and improves memory by reducing the number of intermediates used.
IE11 introduces multi-monitor support, a unified optical zooming model, a wider selection of default scale factors, and support for the devicePixelRatio property to ensure the consistency of your site’s text, touch targets, and layout across Windows 8.1 devices.
See "High DPI support" for details.
IE11 introduces foundational support for WebGL, a set of APIs exposed through the canvas element for rendering interactive 3-D and 2-D graphics.
For more info, see "WebGL".