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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):

real    0m0.037s
user    0m0.000s
sys     0m0.011s

real    0m0.032s
user    0m0.000s
sys     0m0.009s

real    0m0.032s
user    0m0.004s
sys     0m0.007s

real    0m27.316s
user    0m0.018s
sys     0m0.000s

real    0m28.837s
user    0m0.008s
sys     0m0.012s

real    0m29.157s
user    0m0.000s
sys     0m0.017s

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.


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