I've turned off antialisasing in the beginning and turn it on again just before the final image is rendered.
$myPicture = new pImage(400,400,$MyData);
$myPicture->Antialias=false;
$myPicture->Antialias=true;
$SplitChart->drawRadar($myPicture,$MyData,$Options);
This helps a little bit, but not much.
I only input five arrays, each with three floating point values. So there shouldn't bee too much data either.
I'm using Hostgator VPS.
Any advice is highly appreciated