Linksys WRT 1200AC Gigabit Ethernet Speed Mac OS X

Hi I can Make File Transfer cable with Gigabit Ethernet Windows 10

2.8 GB File

80-90MB/S

But I wired cable Mac Mini MAC OS X El Capitan

2.8 GB File
50-65 MB/S

Where is the diffrence ? How Can I Gigabit Ethernet this Solution ?

İs This Normal ? Windows 10 Speed gigabit Mac OS X More Slow Gigabit Ethernet file transfer ? ? ?

Thankyou.