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I have the newest 2020 iMac (latest Big Sur OS), connected via wifi to my google wifi router. Speeds at the router and on other devices are usually about 400mb/sec. On my iMac, after a "random" while of usage, it will drop to about 100mb/sec or less and stay that way until I reboot. (Zoom will tell me I have a bad connection, etc.) Even turning off/on my wifi doesn't help. Any suggestions? I cannot find the cause. So annoying!
iMac 27″, macOS 10.15
Please navigate to the Mac App Store or navigate to www.Etrecheck.com and download the free version of EtreCheck. Once you have you downloaded the app and installed it, please run the report and save it. This report will help us get a good idea what has been installed on your system and help us be able to diagnose what may be wrong.
When you have your report, you can attach it when you reply to this message and we can then review it and help you determine what is needed to get your system running well again.
For instructions on how to download your EtreCheck report and attach it to your reply to this message please click https://discussions.apple.com/docs/DOC-250000211
Please navigate to the Mac App Store or navigate to www.Etrecheck.com and download the free version of EtreCheck. Once you have you downloaded the app and installed it, please run the report and save it. This report will help us get a good idea what has been installed on your system and help us be able to diagnose what may be wrong.
When you have your report, you can attach it when you reply to this message and we can then review it and help you determine what is needed to get your system running well again.
For instructions on how to download your EtreCheck report and attach it to your reply to this message please click https://discussions.apple.com/docs/DOC-250000211
The issue could be the DNS settings you use. If you have never changed them from the default your ISP provides that is a frequent cause. Here is an article that provides some insight and how to change them to something more stable than the ones your ISP uses.
https://support.apple.com/en-gb/guide/mac-help/mh14127/mac
https://www.cnet.com/how-to/how-to-change-dns-windows-mac-osx/
Your EtreCheck report looks fine. Glad the modem/router restart helped that usually solves most modem and router problems. People tend to overlook this simple solution however I'm pleased you thought of it, good job!
If you haven't already, please mark this thread as solved....doing so may help another user with a similar problem.
Actually this problem isn't solved. My problem is: Why does my iMac randomly decide to dramatically slow down my internet speeds? (All my other connected devices maintain their speed.) If I reboot the iMac the speeds go back to full speed.
Thanks! It was down to 40mb/sec. Should be 400! So, I reset my modem/router and it's back up to full speed. This is one solution. The other is to reboot my imac.
See results....
Thanks. Good thought. But, in my case it's the default. No custom entries.
That is what I'm saying, if you use the defaults that could be the issue. Please look over the CNET article and that will help explain.
Ok. I changed my DNS to 1.1.1.1 (Cloud Flare, in the article) and the speed is still slow.
iMac randomly slow internet until reboot
