For my system it hovers around 50-70ms[1][2]. Tested with an 800x600 window at ~7% cpu utilization on a Core i5. My desktop monitor is a Dell u2711, which seems

For my system it hovers around 50-70ms[1][2]. Tested with an 800x600 window at ~7% cpu utilization on a Core i5. My desktop monitor is a Dell u2711, which seems to add about 15ms latency itself[3]. I'm not sure how much latency OSX or Chrome adds (at least a frame more than Firefox[4]); Mobile Safari seems to be a bit faster, as evident in the video. I don't have a second Windows machine for comparison. Edit: When connecting on the same machine, latency is 2 frames (33ms) exactly[5]. [1] http://phoboslab.org/files/jsmpeg/jsmpeg-vnc-latency.mp4 http://phoboslab.org/files/jsmpeg/jsmpeg-vnc-latency.mp4 [2] http://phoboslab.org/files/jsmpeg/jsmpeg-vnc-latency.jpg http://phoboslab.org/files/jsmpeg/jsmpeg-vnc-latency.jpg [3] http://www.anandtech.com/show/2922/4 http://www.anandtech.com/show/2922/4 [4] http://phoboslab.org/log/2012/06/measuring-input-lag-in-browsers http://phoboslab.org/log/2012/06/measuring-input-lag-in-brow... [5] http://phoboslab.org/up/B2u6w.png http://phoboslab.org/up/B2u6w.png