This will help you better diagnose if gameplay issues are related to server performance or your connection. In addition to showing your ping on the scoreboard, you will now also see in-game icons on the HUD if you are experiencing connection problems. The trade off here is getting more and better visual effects during the game, like lensflare, dynamic shadows, and depth of field.
Quality mode bumps the docked resolution up to 1080p, 720p handheld, and 30 FPS. There is some dynamic resolution scaling to keep the framerate up, but it should be pretty infrequent. In performance mode, the resolution is 900p when docked, 720p in handheld, and 60 FPS. Now, however, the choice is in the hands of players to choose between performance mode and quality mode. As any Switch owner could guess, you'd get Rocket League running at 720p when docked and 576 when in handheld or TV mode. Originally Rocket League on the Switch was designed to run at 60 FPS, which dropped the resolution to run at a range of 720p to 576p. The different modes come as part of the game's 1.43 patch which includes tweaking for other versions of the game, new vehicles, and tournaments.
Meaning Switch players now have to make the dreaded choice of performance versus quality.
Psyonix has added a new option for Rocket League on the Nintendo Switch which will allow players to bump up the game's resolution and add effects while sacrificing some framerate speed.