ContributionsMost RecentMost LikesSolutionsRe: Slow internet speeds after installing Hamachi You need to open CMD (Command Prompt) as admin and put the commands below: Try this to check the status of Receive Window Auto-Tuning Level netsh interface tcp show global and if it is disabled, turn it on with netsh interface tcp set global autotuninglevel=normal Need to be run with admin rights cmd (and shift+ctrl when you run it). As far as we understand it you would most likely want Receive-Side Scaling State enabled as well. netsh interface tcp set global rss=enabled Re: Slow internet speeds after installing Hamachi This worked perfectly. Thank you so much!