Windows 11 Network Speed Reduced gradually

Windows 11 Network speed getting slower overtime. 

I run OpenSpeedTest-Server in my LAN to run this Stress Test. (Full 1 Hour Continuous speed test)
Results should be 9400+ for Download and Upload, 
I run this test on Chrome and Edge on My Windows 11 Machine and observed same issue. 

I run this test on MacOS and Linux on Safari, Chrome and Edge. Everywhere i got 9400+ for upload and download. So this is a windows specific issue. 
How to solve this issue?