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Q1: Low Bandwidth ?
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Q2: Low RAM ?
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New incompatibility between ggplot2 + plotly + shiny widget IDs -> roll back
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Chrome's JavaScript engine freezing and/or running very slowly -> change browser settings or browser, otherwise https://d3js.org/ will not work
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Chrome/Iron keeps refreshing ("Calculation in Progress" message every second) -> update browser or change it
in addition - no js problems observed using: Opera portable, SRWare Iron portable, Chrome portable, previous versions of Firefox, IE...
bonus:
http://tommykrueger.com/projects/d3tests/performance-test.php
https://mango-is.com/blog/engineering/pre-render-d3-js-charts-at-server-side/