There are many reasons your Internet connection might appear slow. It could be a problem with your modem or router, Wi-Fi signal, signal strength on your cable line, devices on your network saturating your bandwidth, or even a slow DNS server. These troubleshooting steps will help you pin down the cause.
I have a problem w/ my MacBookPro for 2 days: internet became very slow all of a sudden, it takes 5-7 min to open a page in Safari or FireFox, sometimes it says "Failed to open". I tried everything: repair permissions, reset location, clear cache, checked the free space on HD (18,9 GB out of 141 GB). A Guide To Solve Why Is My Internet So Slow On Mac And Aug 27, 2019 Having Slow Internet on Windows 10? Here’s What to Do Jan 29, 2020 Fix your slow Mac once and for all - CNET
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How to Fix: Slow WiFi Internet Connection on Windows 10 Mar 05, 2019 10 Shit-Easy Ways to Fix Slow Internet on Windows 10 - Saint Just a little note/heads-up. Setting the autotuning feature to disabled actually slowed my internet down. It cut my 500Mbps connection down to 250 or so. After turning autotuning back on, my speed went back up to its usual 500. So make sure you do a speed test after applying this tweak to see if it actually has a benefit for you. Reply