The HTML5 client (noVNC) does not have any of the "TurboVNC-like" optimizations, nor our high latency improvements. There are some discussions about this upstream: https://github.com/kanaka/noVNC/issues/221 https://github.com/kanaka/noVNC/issues/159 https://github.com/kanaka/noVNC/wiki/Performance-notes https://github.com/kanaka/websockify/issues/77
Note that continuous updates has been implemented in Web Access since a while back.
All of the suggested things have been implemented, including a faster zlib library. Close?