Dahua VTO2111D-WP "1st gen" FIRMWARE upgrade

Thanks @claudioggs.
Today I checked status ofp2p settings and turned out it got connected to servers, but when I tested, I got delays as well. Firmware reinstall didn't help in my case.
 
Any updates for the thread? I also have delay and low performance when someone ring the bell, even if my phone is in the same network. Otherwise if I just check camera and try to speak or unlock door is so and so. After updating internet speed to 100mbps/10mbps, I was hoping it would be much better, but... no....