My MacBook 12" (Macbook 12 2015 Macos BigSur). I also had the problem in Catalina. I have made a clean install, and it didn't help.

It experiences slow Wi-Fi connections constantly! I cannot use apps for streaming like Netflix or sky or any other, because resolution drops from HD 720 to 144p every time. This is very bad!

Some basic tests: Ping 2, Down 255mb, Up 23mb.

I assume there is something going on with the power saving.

Is there a way to disable all power savings? I want to have maximum Wi-Fi performance possible.

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    Do you mean a MacBook with a 12" screen? Are you sure your wifi is fast enough and you are close enough to the router? Do other webpages load fast? Try speedtest.net/de to check your connection. There are power saving options in the system settings but they should not affect browsing performance. – X_841 Nov 27 '20 at 16:45
  • Yes of course my internet speed is fast enough, the macbook goes is a state of "power saving". You cant watch a streaming video. With other laptop is fine – QUELLORITARDATARIO Nov 27 '20 at 16:50
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    Which specific MacBook 12"? There are models that go from Early 2015 through Mid 2017. You asked two very different questions - one about WiFi and the other about power settings. Which one do you want to focus on? This site works best with one topic per question. Please edit your question to narrow the scope (topic) and provide sufficient details about the problem and what you've done thus far. – Allan Nov 27 '20 at 17:24
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    Also Why are you assuming it's "power saving?" Power saving is related to sleep/hibernation etc. – Allan Nov 27 '20 at 17:26
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    (Rhetorical) How does the power requirements of the CPU and the fact it doesn't have a fan have anything to do with power and WiFi performance? It's helpful when asking a question to let go of any preconceived theories you might have because if you focus on a particular aspect, you'll skip over other, more obvious avenues to a solution. – Allan Nov 27 '20 at 17:44

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