OBS changed the way it handles late frames in 0.57. Before, it would lag the video when you were encoding too slow. Now, if it takes too long to encode a frame, it duplicates the last one so that it can get to the next frame in time.
If you're getting skipped frames now, it's because you had late frames in older versions of OBS, but didn't realize it, because OBS didn't have a warning message for it.
Changing your webcam setting could help with your late frames, because MJPEG is easier to decode than I420. I've seen it help for others. According to your profiler, the biggest slowdown is in capturing your sources, including your webcam, so even though your webcam isn't lagging, it could be causing your frame times to be too high.