This is a bit of a background kind of question. I've got a VM 200Mbps connection at home and it's rock solid and fast. Zero complaints. I've worked from home as IT specialist for six years. Everything fine except recently I'm getting performance issues with Microsoft 365 services, specifically the various admin consoles. Not just for one tenant/domain either - I support several companies and it's occurring with them all.
Now of course my initial thoughts is that the M365 servers are overloaded. After all, I've occasionally had similar performance problems (pages not rendering) when working at my main clients site where the internet is via M247 and 1Gbps.
But Microsoft are denying any problems and the fact that if I remote into a laptop at this client's site, the same web pages open fine, it does suggest that it's not a problem with their server.
So what else could this be? My internet connection is fine, every other web site and service (like Outlook/Exchange) works flawlessly. Just get errors like this:
Loading chunk 6330 failed. (error: https://prod.msocdn.com/M365/admin-main/2022.4.14.7/inline.en.6330.chunk.js) df32c1e2-9477-4574-af1d-b160789e9f72
My thought is that Virgin Media have had routing problems in the past and when only one service is effected, one's thoughts turned to invisible downstream proxy/caching servers. Not the first time that invisible caching has caused problems with ISPs.
Next time I get problems, I'm going to connect my laptop to my mobile hotspot and try that route.