Light symbols use the minimum amount of objects, parameters,
conditions and interactors necessary to display an understandable
message. Use the following guidelines to create symbols with the smallest
memory footprint:
Use as few objects as possible.
Use a static background.
Use light (PNG) images.
Use the visibility option.
Avoid transparency.
Avoid complicated gradients.
Avoid thick lines.
Turn anti-aliasing off.
Turn fraction metrics off.
Rendering operations take up a lot of CPU time. The fastest
and lightest symbols are made by changing the visibility setting for
a collection of PNG images.