slow drawing with large images

[Bastian M. <bma...@we...>]

When drawing large images (binary and ascii) gnuplot is veeeery
slow on my (windows) machine. E.g. with an image (RGB) of 1024*256
pixels it takes about >5.5s to output on any terminal.

Profiling reveals that gnuplot spends >75% of it's time in
gp_realloc()  <--  cp_extend() <--  get_data().

The crucial point is that the maximum increase of the points[]
array is limited to 1000. Changing line 411 in plot2d.c

- cp_extend(current_plot, i + (i < 1000 ? i : 1000));
+ cp_extend(current_plot, i + i);

eliminates that problem, but uses exceedingly large amounts
of memory.

Can anybody confirm this behaviour on non-windows machines?
Or is this a problem of gp_realloc() on Windows?

Bastian

--=20
Bastian M=E4rkisch
Physikalisches Institut, Universit=E4t Heidelberg