You have a similar experience like you described above with those USB video adapters that don’t run DisplayPort. They use lossy compression and - as a byproduct

You have a similar experience like you described above with those USB video adapters that don’t run DisplayPort. They use lossy compression and - as a byproduct - have increased latency compared to a DP/HDMI output. Displays aren’t special. It’s just that they’re moving huge amounts of data hundreds of times per second, so they use a specialized protocol to do so.