I had a similar issue! Around 2017 I moved into a new house and my MacBook Pro started getting latency spikes every few minutes. Not as bad, but still noticeab

I had a similar issue! Around 2017 I moved into a new house and my MacBook Pro started getting latency spikes every few minutes. Not as bad, but still noticeable. This irked me quite a bit, because I spent several weeks wiring my house with the best POE-powered WiFi access points available at that time. So I spent some time debugging the issue, and it turned out that the culprit was in the location services! For some reason, the weather widget tried to check the location every few minutes, and that involved scanning for the WiFi access points. Which in turn meant that latency spike, I posted about it on StackOverflow ( https://superuser.com/questions/1142798/experiencing-high-latency-on-wifi-every-other-second-with-macos-sierra/1348295#1348295 https://superuser.com/questions/1142798/experiencing-high-la... ).