Speeding Up Plots in R/Shiny
summary
Slow plot rendering traces to three concrete causes and fixes: expensive data prep, naive plotting of millions of points, and library-level inefficiencies. Move aggregation into the database and compute five summary stats in DB for boxplots instead of fetching all rows. Replace dense scatter clouds with summaries or interactive controls to reduce rendered marks. Enable browser GPU rendering like WebGL/boost mode and prefer faster serializers such as switch to RJSON (25x reported) to cut client-side latency.
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