23:23:05.521: Output 'simple_stream': Number of lagged frames due to rendering lag/stalls: 2073 (0.4%)
23:23:05.521: Output 'simple_stream': Number of dropped frames due to insufficient bandwidth/connection stalls: 783 (0.2%)
Seems like some dropped frames due to bandwidth/connection problems and some lagged frames due to GPU overload.
Other suggestions:
- reduce webcam resolution, to reduce unnecessary GPU, USB and CPU load (in a 1080p stream, your webcam usually doesn't need 1080p, as it's not using the whole scene)
- check your upload speed and packet loss
- increase bitrate if possible or decrease resolution, because RocketLeague will not look very good with 1080p 30fps and only 5000kbit/s