why did my download speed drop by more than half after installing Big Sur?

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Level 1

73 points

why did my download speed drop by more than half after installing Big Sur?

On my 2013 Air running Mojave I was getting ethernet download speeds of 800-900 per my ISP plan. I updated to Big Sur (as far as I can go with this old sturdy computer), and now my download speeds can barely hit 300. (Meanwhile, my High Sierra and Sierra computers are still getting 800-900, so it's not the ethernet or ISP.) Oddly, my upload speeds went from 20 to 80-90. But I want my download speeds back. What could be causing this? And how can I fix it? Thanks.

MacBook Air 13″, macOS 11.7

Posted on Oct 11, 2024 8:08 PM

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Answer 1

Old Toad

Level 10

210,633 points

Oct 12, 2024 11:28 AM in response to william98

Have you installed and run any "cleaning", "optimizing", "speed-up", anti-virus or VPN apps on your Mac, either before or after the upgrade?

Please download and run Etrecheck. The free version is sufficient.

Copy the report as shown in this animated screenshot

and use the Additional Text button to paste the report in your reply.

Then we can examine the report and see if we can determine the cause of the problem.

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