Drupal's default caching mechanism is to clear "all" cache. This is rather inefficiënt. There are options to clear specific caches only, here's how. 

bash-5.0$ drush cc

 Choose a cache to clear:
  [0] Cancel
  [1] drush
  [2] theme-registry
  [3] router
  [4] css-js
  [5] render
  [6] plugin
  [7] bin
  [8] views
  [9] token
 > 6

 [success] 'plugin' cache was cleared.