HTTPS traffic 40x slower than HTTP in Windows 10 x64

problem solved.

netsh interface tcp show global

netsh int tcp set global autotuninglevel=normal

auto tuning was set to disabled for some reason on all my windows 10 PCs

I am on Windows 10 and HTTPS traffic is certainly not capped, as it is now used by practically all websites.

What you may try is :

1. Disable your firewall.

2. Reboot is Safe mode with network, to verify if this is caused by some installed product.

3. In Control Panel / Internet Options, Advanced tab, scroll down to the Security section and uncheck "Use TLS 1.2" and reboot.

Question: Does this problem arrive with more than one browser?