Raspberry PI 3B Network speed issue


I have network speed problems in all versions after kernel update after core update 158. My problem here is 50% loss in my download speed.
how can I fix this problem? internet connection : 100/8
before update my speed : down : 95 up: 8 Mbps
after : down: 55 up:8 Mbps

Red : USB to ethernet 1 gbps
green :ethernet
blue : wifi
I changed the network cards of green and red, but the result did not change.