Something is off. Websites on Fastly (Reddit, CNN, Lifehacker amongst others) which previously used to go to the Middle East are now being rerouted (to Singapore, maybe?).
Cloudflare is being rerouted to somewhere in Europe (I'm in Islamabad, and Cloudflare's dashboard says it's being rerouted for Islamabad, Karachi and Lahore - TW1 is fine).
Last night, I was installing Office 365. Speeds? Max 2-3Mbps (using their web installer). I downloaded their offline installer using a download manager and got full speeds.
In the morning, I was installing it on another machine (my dad's) - speeds are less than 1Mbps for the same installation (and still are - since 11 am or so). I think their CDN is messed up because speeds varied between 1Mbps and 3Mbps on my tethered 4G via TW1.
Barring Microsoft's CDN servers, something seems... off. My IPTV (not Smart TV - another service) seems to stream fine, including the HD channels (which require ~5-10Mbps speeds). It's sluggish at times, but not always... it's a bit flaky, perhaps.