Bug#954845: poor performance for -g 256x50
You can reproduce the performance fall-off by using a slow network connection,
e.g. via IPsec and DSL and public Internet to a remote site. The "small numbers"
case was taken using a local network connection from one Linux PC to another.
Ping shows a round-trip time of 0.3ms for this local connection.
Here is the same sample session as above, now using the IPsec connection
between my office and my home PC (ping: 20ms):
If I use an xfce4-terminal instead of xterm, then the numbers for 253x50 and 258x50
and in between are the same as for xterm with 255x50. Same network connection, of
course. xfce4-terminal does not show the performance fall-off as xterm.