Add Export with more quality. When using the .png we can see the pixels on the image.

[matuchote4]

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[jesseloudon]

+1 to this. The export diagram quality is significantly reduced compared to what you see in the browser app.
I've been able to workaround the issue by creating a white background on my diagrams (which covers up the default diagram grid lines) and then taking a screenshot of the diagram using a Snipping Tool.