I tried an experiment about if I can sync a Virtual Boy game from BizHawk to VBjin.
Game tested is 3-D Tetris once again, but since Stage 10 (Toadie) it desyncs because it starts earlier than in BizHawk (timing fail)...
the mednafen core has better emulated timings. Usually only the length of lag frames changed, not the frequency.
Teleroboxer TAS done in BizHawk, previous one in VBjin, you can compare the two files (after extracting and removing some lines from inputlog) to see the difference in emulation.