allow a difficult website


i have this website that is torturing me : 

I added it to the web exception , added it to local category , etc but still it is not working

if i allow all , it works , if i dont , i get extremely slowness and certificated revoked errors

what can i check ?

Added TAGs
[edited by: emmosophos at 9:00 PM (GMT -7) on 14 Apr 2021]