I recently switched from Comcast to AT&T Fiber, and yes, my speeds are up according to speed tests. But on certain routes I only get 30Kbps (sometimes to Azure!

I recently switched from Comcast to AT&T Fiber, and yes, my speeds are up according to speed tests. But on certain routes I only get 30Kbps (sometimes to Azure!). Wikipedia and Twitter only loads half the time. Sites that don't use TLS sometimes load a gibberish. So yes, the speed is faster, but I kinda want to switch back to Comcast. And don't get me started about the idiotic, mandatory $10/month shitty router they require you to use.