I was experiencing the lag issues on AT&T Fiber in North Houston to a point where Frontlines had everyone standing still, then jumping to the current status.

I downloaded and installed (already have a paid subscription) NordVPN, then chose to connect to the LA node. I also used WTFast in conjunction with it and noticed further improvement. Because it's working and Frontlines was without noticeable lag, I haven't pinpointed which action addressed the issue, though it may be both in a sense.

I simply wanted to share my current situation with the hopes of it helping. I didn't read all responses in the thread, though, so I apologize if this was already said.