As long as we don't know anything about the site and can't see exactly what the problem is (we don't see the site itself), there's no way we can do anything or help.
So, please provide the address of this site and at least one example of when it gets blurry. (Link on search result site what You clik before it goes blurry).
The only thing that can be offered for the time being is that the site does not open completely and the foccus assistant cannot put it in focus, that is, in simpler language - the browser cannot download all site components so that it can focus.
There can be many reasons, starting with the server and the coding of the site itself and ending with the quality of the internet connection and the computer's capacity.