Avast slowing down the loading of image rich Internet sites

I’m using Avast without problems on my Windows 10 installation, but it apparently was making it difficult for my spouse to load image-rich sites like Amazon and Facebook on her new Windows 11 computer. The evidence is that once I removed Avast, the problem disappeared. As of this week, I’ll be using the exact same model and will not install Avast unless I get some assurances that I won’t encounter the same difficulties.

I wonder if this is related to other reports of difficulties with Amazon and Facebook e.g. Avast block facebook from opening - #15 by prokopes_

Which Avast Product are you using on your Win11 computer?
Which web browser or browsers are suffering this issue on that machine?

Note I am not an Avast Team member, just another user.