This is interesting, Xtreme2damax.
That said, omegadox's guess is probably right. The game (not dolphin) might load and cache the vertices once you have revealed the greater field. This would cause dolphin to perform more processing and therefore slow it down. A telling clue would be to have a similar slowdown on the real hardware.
To definitely know the cause of the slowdown, we would need to use a profiler. Do you know how to operate a profiler? The basic instruction is:
1. Play dolphin up to the just before entering Twilight Hyrule Field where it will still be 30fps.
2. Perform a savestate and exit dolphin
3. Start the profiler
4. Start dolphin from within the profiler and load the savestate
5. Record what it is doing at 30fps using the profiler.
6. Exit dolphin and the profiler
7. Start dolphin only, and load the savestate and play the game so that you jump over the gate etc until the bit just before the game hits 10-15fps.
8. Make a save state
9. Start the profiler and dolphin from within the profiler
10. Load the new savestate
11. Using the profiler record what happens when the game is running at 10-15fps.
12. Copy and paste both the old and new results from the profiler for us so we can identify the cause of the slowdown. From there, we might be able to optimise dolphin to minimise the effect of the slowdown.
That said, omegadox's guess is probably right. The game (not dolphin) might load and cache the vertices once you have revealed the greater field. This would cause dolphin to perform more processing and therefore slow it down. A telling clue would be to have a similar slowdown on the real hardware.
To definitely know the cause of the slowdown, we would need to use a profiler. Do you know how to operate a profiler? The basic instruction is:
1. Play dolphin up to the just before entering Twilight Hyrule Field where it will still be 30fps.
2. Perform a savestate and exit dolphin
3. Start the profiler
4. Start dolphin from within the profiler and load the savestate
5. Record what it is doing at 30fps using the profiler.
6. Exit dolphin and the profiler
7. Start dolphin only, and load the savestate and play the game so that you jump over the gate etc until the bit just before the game hits 10-15fps.
8. Make a save state
9. Start the profiler and dolphin from within the profiler
10. Load the new savestate
11. Using the profiler record what happens when the game is running at 10-15fps.
12. Copy and paste both the old and new results from the profiler for us so we can identify the cause of the slowdown. From there, we might be able to optimise dolphin to minimise the effect of the slowdown.