Tiktok Live

Hey, I had a question about mobile gaming on Live! My internet provider is Xfinity, and I have the blast pro package 1200mbps+. When I run a speed test through tiktok, I'm only getting like 53mbps max.

When I run a Google Speed test, I'm clocking over 600mbps. When I check my live replays, the audio is cutting in and out, and the video is very choppy. How can I fix this to run smoothly?