Whenever I log in into my account on my 5K 27" 2017 iMac, my whole network starts to have a huge ping to internet, but locally everything is fine. When I ping google, I get over 2000 ms on every device. And It happens only on my user account. I tried to use other cable or use wifi, but every time It's the same. It started a week ago. I have Mac Os Catalina installed.


Apart from Enabling QOS on your network, I think you’ve shown that your internet egress/ingress can’t accommodate the amount of traffic your Mac asks for. One large source of traffic could be iCloud data being cached locally:

You can dig into everything the Mac is doing by opening Activity Monitor - select network and look at the received and sent packet counts and volume. Over 30 to 300 seconds, you should have a good idea if you can or care to quit programs that are asking for more data than the router can accommodate.

Also - check with your ISP / router support team. There are quality of service and other items that can prevent buffer bloat and allow ping/ICMP traffic to not be impacted by large downloads. You don’t have to change anything on the Mac to keep ping times exactly where you wish - just most people and routers will let any one device take all the network - first come, first serve. You could change that on the network side.

  • I opened the Activity Monitor, and I saw, that a process called "nsurlsessiond" sent a big amount of packets. I looked online, and now I know why. I bought more space on icloud drive and all my photos were trying to get uploaded to the drive. Thanks for help! – Maksym Ślugajski Nov 10 '19 at 15:07
  • @MaksymŚlugajski Well done. I’ve linked to our main question about “nsurlsessiond” since it’s sometimes hard for people to know what it’s doing. In your case - it makes perfect sense. – bmike Nov 10 '19 at 15:13

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