Hi there,
This is out of our scope, there are plenty of resources online regarding this, a lot of it will be to do with the amount of and type of ads being placed. There are some methods, such as lazyloading ads so they don’t block the loading of the page. Some articles i did find:
A technical way of defering the loading of ads after page has loaded:
https://gulshankumar.net/setup-lazy-loading-google-adsense-ad-units/
A plugin for ad management – it may require the Pro version to lazyload ( not sure ):
https://wordpress.org/plugins/advanced-ads/
Hope this helps