ContributionsMost RecentMost LikesSolutionsRe: Slow internet speeds after installing Hamachi Glad our technical investigations were of help to others 🙂 I thinkHamachi are aware. One of my mates also posted the problem/solution on the forums, and if I remember correctly, he got an answer from one of theHamachi employees stating they would fix it in some upcoming release. I believe, this was a few weeks ago (and pretty long after we posted). Re: Slow internet speeds after installing Hamachi Try this to check the status ofReceive 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 This helped me and two mates. The settings 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 wantReceive-Side Scaling State enabled as well. netsh interface tcp set global rss=enabled We have not tested Hamachi after changing these settings. Nevertheless, just wanted to share because this problem was making us crazy.