Fixing dashboard sizing

Dashboards can be set to an exact size or to Range or Automatic. Exact size results in quicker performance because once Tableau Server has rendered a view for one end user that render stays in cache and can be reused for the next end user that accesses that dashboard. 'Automatic' and 'Range', on the other hand, cause Tableau Server to attempt to determine the resolution size used by each end user and render the dashboard accordingly. This means that Tableau Server does not use the instance of the dashboard stored in cache for the next end user; this, in turn, impacts performance.