I have the same issues as well since the last update (25.3.9983a (build 25.3.9983.926)). It is mostly on YouTube, Facebook & Instagram as well as other websites. For the past month it makes websurfing a real pain until I disable Avast which is unwise.
I disabled at least the QUIC/HTTP3 scanning within Avast and it seems to have improved my surfing experience greatly until they fix things within Avast.
