Large diagrams - the edge limit and export scale

More than 500 edges

The renderer has a safety limit of 500 edges per diagram. Above that you get “Diagram too large”, which is not a syntax error. Split the diagram by module or trim the branches; a diagram this size does not fit on one page in any tool.

Rendering takes a few seconds

Flowcharts and mind maps with a few hundred nodes keep the page busy for a second or two while the layout is computed; “Rendering a large diagram…” shows above the preview meanwhile. When the code is longer than 8000 characters, the automatic re-render after editing waits a little longer (0.7 s) to avoid wasted work.

Export scale gets lowered

When exporting PNG, if the canvas would exceed roughly 32 million pixels or 16000 pixels on a side, the scale is lowered by half a step (for example 3x to 2.5x) so the browser can draw it. If even 1x is too large you are asked to export SVG instead, which is vector and has no pixel limit.

AI fix length limit

AI fix handles code up to 8000 characters. Split the diagram first if it is longer.