iMac broadband connection slows down after a couple of hours

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Level 1

4 points

iMac broadband connection slows down after a couple of hours

Hi,

I use an iMac (Retina 4K, 21.5-inch, Late 2015), running macOS Catalina Version 10.15.7 (19H2). I also have an iPhone and iPad but details aren't important.

The issue: my iMac's broadband connection slows down after a couple of hours of being in use. I normally get download speeds of around 100Mbps. When I (re-)start my machine, broadband connection is fine. After a couple of hours, I notice it drops to around 5Mbps. This doesn't happen to my iPhone or iPad, so I think the cause must be my iMac rather than my broadband connection. Speed doesn't change when I close certain apps.

Any advice appreciated - whether there is a known issue/cause, or if there's a way I could try to identify the cause (and then rectify!). Thanks in advance.

iMac 21.5″, macOS 10.15

Posted on Nov 26, 2020 11:57 AM

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Answer 1

rkaufmann87

Level 10

141,198 points

Nov 29, 2020 6:51 AM in response to sheffield456

You can save you and us a lot of time and effort if you do the following:

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

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