Webpages take up significant portion of CPU

Recently, my Safari keeps telling me that webpages take up significant portion of my resources. Then, the webpage would refresh by themselves, despite the fact that I have 1 TB of HDD, 265GB out of which are free. I have 10.14.6 OS and have about 10 tabs open (which is waaay low number for this warning to happen).

Hey there!
The solution and why is that caused is in the following link