Same behavior with 184.108.40.206.
On this specific computer no special GPU - unfortunately.
CPU: i5-6300U 2.50 ghz
RAM: 16 GB
GPU: HD Graphics 520 (driver version 220.127.116.1142 from April 2020)
Windows 10 PRO 2004 - build 19041.450 with feature experience pack 120.2212.31.0
By analyzing the network traffic I have been unable to identify what is happening.
But it is obvious that the network load is increased when I start ManyCam and so is the CPU load.
Basic network load with ManyCam is 7.7 mbps (not a lot) but without ManyCam it is lowered to 40-160 kbps (no other applications open).
(I also see that a soft phone, when started, used a great deal of bandwidth, but I never run the to applications simultaneously.
On another Windows PC with i7… 32gb ram, lots od SSD space and an old Nvidia 1060 6gb GPU I see no issues what so ever with bandwith.