Very simple frame skipping code!

[daging623]

I think the heavy functions in the OpenGL pipeline are the PRIM, BEZIER, SPLINE and the frame buffer transfer command (XKICK if I remember correctly). The other ones aren't very time consuming.

Yes, PRIM, BEZIER and SPLINE can be skipped, but TRXKICK should not: it is used by some games to copy parts of the display list.
Also, bounding boxes can probably be skipped as well: skip BBOX and always take the jump in BJUMP.

Also I don't know if it is possible to use a profiler to check where exactly is the heavy rendering part, it would help a lot.

Statistics (e.g. duration of each VideoEngine command) can be activated by setting jpcsp.util.DurationStatistics.collectStatistics to true. Statistics are then displayed in the log file when Jpcsp exits.

In your draft implementation, you were actually not skipping any frame rendering: the GE list was still enqueued in the VideoEngine, the list processing was just delayed (probably to the next VSYNC). This would probably only cause the application to run slower, but not skip any frame.
The approach proposed by Orphis is much more promising.

I am kinda of update Jpcsp to the newest possible recently, hopefully to see it with significant improved performance, but it is desparated to see the newer version never come up with frame skip option, or the developers just totally ignore it? But when I read this thread, I am so happy that I find a hope to play my long await game at last at a better fps.
I renamed the sceDisplay.java.bak to sceDisplay.java and repack the jpcsp.jar, and put the "private int frameSkippedCount = 30" , put the "if (frameSkippedCount >= 30) { // 6: number of frames to skip" , still the Megaman X maverick hunter is running slow, is it a ways to frameskip for the game? I have a slow computer btw.