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Render all widget frames instantly and add placeholder content (for example Facebook has a few thick grey lines, even if the content eventually is an image).
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Figure out a way to make the UI not jump around when clicking things.
For example on the overview, when clicking to get a graph of other metrics, “Loading …” is added to the bottom of the graph causing the entire layout to jump. A better solution might be to overlay spin.js on the graph instead.