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Creating arrows between elements has a huge performance burden #179

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@yuchi

The code at this line is called many teams every “tick” when dragging from a shape with A pressed (to create an arrow). In my profiling session it was called 7 times every tick.

Most passes through that code cause a 20ms delay, which pretty quickly sum up to 100ms and jagger the UI.

There’s some cacheing opportunity here. How could I help?

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