Latency/Speed graph is not accurate

[stdedos]

As insinuated also in ​http://xpra.org/trac/ticket/2617#comment:22, the graphs may not be accurate.

See attachment.

"Xpra-Python3-x86_64_4.0-r26306\xpra_cmd" attach ssh://user@ip/20 --ssh="plink -ssh -agent" --modal-windows=no --title="@title@ on @@/@server-display@" --opengl=no --bandwidth-limit=6Mbps

2020-06-08 14:39:33,686 Xpra GTK3 client version 4.0-r26306 64-bit
2020-06-08 14:39:33,688  running on Microsoft Windows 10
2020-06-08 14:39:33,769 Warning: failed to import opencv:
2020-06-08 14:39:33,770  No module named 'cv2'
2020-06-08 14:39:33,771  webcam forwarding is disabled
2020-06-08 14:39:34,502 GStreamer version 1.16.2 for Python 3.8.2 64-bit
2020-06-08 14:39:34,954 keyboard layout code 0x409
2020-06-08 14:39:34,954 identified as 'United States - English' : us
2020-06-08 14:39:35,240  keyboard settings: layout=us
2020-06-08 14:39:35,242  desktop size is 4160x1440 with 1 screen:
2020-06-08 14:39:35,242   Default (1100x381 mm - DPI: 96x96) workarea: 4160x1400
2020-06-08 14:39:35,242     Generic PnP Monitor 1600x900 at 0x534 (309x174 mm - DPI: 131x131) workarea: 1600x860
2020-06-08 14:39:35,243     C32JG5x 2560x1440 at 1600x0 (697x392 mm - DPI: 93x93) workarea: 2560x1400