After coloring with the highlighter tool, it takes a really long time to load.

The slowness is from the current limitation of the highlighter tool. Since GoodNotes stores everything in vector format, it needs to redraw each stroke one by one each time a page is loaded. With normal pen, this is not a problem because they are opaque, but with highlighter, semi-transparency requires a lot of processing power. Therefore, it is recommended to avoid too much overlapping highlighter strokes, which usually happens when highlighting back and forth over the same place.

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