In this week’s edition of Tech 911 — the column that addresses any and all technological troubles or questions you have — a Lifehacker reader is dealing with one of the more annoying problems you can face after building your brand-new desktop system: something not working right.

If you aren't checking your Internet speeds on a weekly basis, you might not know when there's a problem. You aren't likely to notice a difference between 150 Mbps and 80 Mbps download speeds when you're browsing websites, watching (1080p) YouTube, or chatting with friends, but if you're downloading a huge Fortnite update, why drive in the slow lane?