How to check load time of certain divs or blocks?

Hi Everyone,
Is it possible to check load time of certain elements on Drupal site? I have an issue with loading of some pages on my Drupal web site. Can not identify which element causes such long load time. The page consists of quite many blocks with quite many views.

Will appreciate Your help.

Thank You,
migajos

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/22/feed