I've been streaming Tigers games for 20 years.
This will be Year 5 with my newest TV with built-in MLB App (Hi-Sense Google TV). Current internet through AT&T:
I have my latest TV as a second TV. It was an older LG, about 10 years old now, which depreciated the MLB App. It struggled to handle streaming for whatever reason (my parents had a similar TV which also struggled with the streaming age). It does, however, work well with a current model Chromecast. Older Chromecasts or similar may not have the hardware to handle new speeds.
There are times, if I want to, I can stream 4-5 sporting events at once on different devices (Up to 3 TV's, tablet, laptop, phone) with no lag.