title: caching plots in R/Shiny
body: <p>Just wondering if there are tricks/ways in which I could cache the plots being generated through our shiny app. </p>
  
  <p><em>Background:</em></p>
  
  <p>We are doing somewhat compute intensive computations which finally result in  a plot. I am already caching(using memoise) the computations done, globally in shiny but it still takes about .75 seconds to render a plot. I was just wondering if we can decrease that time by removing the time it takes to render an image and if there are slick ways of already doing it.</p>
  
  <p><em>More details:</em></p>
  
  <p>I am using grid to create the plot(heatmap in this case. Ideally would like the caching to be disk based as storing plots in memory wont scale up. </p>
  
  <p>Thanks!
  -Abhi</p>