If you have ads that are embedded into your content then they could be causing the majority of the problem so in that case talk to your ad provider and/or remove ads from the body of the content
readers can easily choose READER mode and bypass your ads…don’t give them a reason.
Yes as ‘the5krunner’ said if you have too many ads embedded into your content then they could be cause also using lots of plugins, can you try deactivate plugins one by one and check, and let us know the result.