title: Effect of Many CSS Variables on Performance
body: <p>This is a somewhat general question.</p>
  
  <p>Is anybody aware of the effects on performance of using many CSS variables within a given document? Has anybody done any tests?</p>
  
  <p>Does the element to which you associate the variable have any effect on performance? Is performance impeded more so by, say, all variables being assigned to <code>:root</code> than assigning them to the individual blocks of styling where they might only be used?</p>