ironrdp-web becomes unresponsive when remote framebuffer updated rapidly

When accessing testufo.com through a browser on a remote RDP server using ironrdp-web version 0.9.1, lag increases until the remote session is unresponsive. Similar issues occur when attempting to play video in the remote session.

The severity of lag correlates directly with the size and update frequency of the moving area displayed on screen. Session responsiveness can be restored by either obscuring the moving area with another window or activating the Windows ctrl-alt-del screen (which also obscures the moving area).

Note that the Microsoft native RDP client handles testufo.com and remote video content adequately under identical network conditions.