While developing new charts, the cache usually gets in the way. This will override the cache and force Chart to re-generate the images every time. Bugs How much space to leave between the grid lines is determined heuristically, and more experimantation is needed to find an optimally pleasing algorithm. Chart hasn't been optimized for speed at all. There are probably many things one can do to make it run faster.
Patches are welcome.
Chart depends on the gd graphics library. Possible coming features Putting text and other images into the charts might be nice. Naming the plots would be convenient. And just about anything else that gnuplot does with two-dimensional plots would be spiffy. Chart is released under the GNU General Public License .