[Hyper-V]: Host network coection takes long for find target (I guess)

I've a little problem with my new virtualization setup.

On my host machine (Windows 10 Pro) I just installed the current Version of Microsofts Hyper-V (via "Add Windows features").

My host Computer have two network cards. (2 x Intel(R) l210)

My configuration is the following: Networkcard #1: static IP for my local network coection to access the www (activated all elements under properties for this coection except ms-multiplex and "hyper-v extensible virtual switch")

Networkcard #2: dynamic IP (DHCP) (disabled all elements under properties except "hyper-v extensible virtual switch")

I added a "Exteal Hyper-V switch" which is called "Bridged" and has exclusive access on card #2.

If i deactivate card #2 the network coection is as fast as normal. I guess my host system tries to coection via card #2 primary and swiches after a specific timeout time to card #1. (not sure but sound plausible?) If the web page for example starts loading it's loaded as fast as normal. But it takes some time until it starts actually loading the page.

The coection order (control panel -> network coections -> ALT-Key -> Advanced -> Advanced settings) also underlines my thesis.

Do you guys have any idea what exactly the problem can be? And if it's the problem that I pointed out above, do you have an idea to change this priority order?

Thanks for the help!