Hello! Thank you for this investigation. The heavy car issue is an elusive beast and we appreciate any community help in resolving this matter. Connecting to PsyNet with high latency should not have any effect on player input, but I'll try it out on Monday to see what happens. To aid in your investigation, here are some points regarding things mentioned in this post:
PC has only been using websockets since April 24. Prior to that communication with PsyNet has been through stateless https requests. So unless your issues just started in the last few days, I wouldn't assume websockets are the culprit.
ConnectionQualitySave just tracks your latency, packet loss, etc to the game servers over multiple matches. This information is used to display a pop-up linking to a support document if a user has recurring connection issues. It is not used to affect your connection settings.
The PsyNet.ServiceCalls metric is just metrics we record that me...