[GRASSLIST:5698] Re: d.rast slower in GRASS5 than 4.3

[Glynn Clements]

Wayne Gibson wrote:

> Has there been a fundamental change in how GRASS displays with commands like 
> d.rast between 4.3 and 5.0.0 or 5.0.1?

Yes; the display system has been substantially re-written.

> I made some comparisons and it is definitely much slower with newer
> versions. I displayed 13 grids in succession as a test

There are a number of possible reasons why it might run slower; the
most likely ones are:

a) The display library might be using more colours.

b) The monitor (XDRIVER) always draws into a background pixmap rather
than directly onto the screen; this results in more work for the X
server.

If the difference is (primarily) due to a) above, the difference
between 4.3 and 5.0 will be a constant, regardless of the size of the
raster or the size of the monitor window. If it's due to b), enlarging
the monitor window will increase the difference.

There could also be other reasons.

-- 
Glynn Clements <glynn.clements at virgin.net>