Review these . . .
Where is the option to change adapter type? [13th July 2017]
Virtual network cards only 100mbs, how to speed up? [8th Feb 2013]
Network speed limitation in Workstation [3rd April 2011]
Troubleshooting a slow network connection in VMware Workstation (2019058) [25th Sep 2018]
Configuring Virtual Network Adapter Advanced Settings [31st May 2019]
From research, what I can glen is that what is shown in the Windows Ethernet Status view for VMnet1 and VMnet8 is just a "reported network speed" and can generally be ignored.
Quotes from other forum entries:
"Virtual NICs do not really have a line speed, since processing is done by the host's physical CPU" [@scott28tt]
" . . . networks are only limited by the hosts CPU resources, but anyway, Gbit network is way faster than anything the virtual disks can handle" [@continuum]
If you run a local network speed test from Host via appropriate network interfaces and from VM . . . what are you seeing ?