The affected Dashboard Tabs are:

• ReviewQueueBlock
• MyContentTab
• MyMediaTab
• MyDraftsUnderReviewTab
• EveryoneContentTab
• EveryoneMeditaTab

To test after optimization one would have to have content in all of the mentioned tabs and:

• validate if the output is the same in all of the tabs before and after optimization.
• validate if fields are visible in the view params (for example in EveryoneContentTab this is just a matter of validating if content fields are visible in:

  'data' => $this->pagerContentToDataMapper->map($pager),
  

• validate performance increase (it would be especially visible when having large contents with plenty of fieldtypes, preferably Landing Page fieldtype as one of them