WhepExample receive videoFrame too slow

[skill7899]

Describe the bug

if (track instanceof VideoTrack vTrack) {
            vTrack.addSink(videoFrame -> {
                System.out.println("Received video frame: " + videoFrame);

                // IMPORTANT: Always release the frame when done to prevent memory leaks
                videoFrame.release();
            });
        }

here println 15FPS
My hypothesis is that the latency stems from slow callback processing on the C++ side. Since CPU utilization is low, we should investigate potential inefficiencies in the C/C++ code.

To Reproduce
Steps to reproduce the behavior:
i test
https://github.com/devopvoid/webrtc-java/blob/main/webrtc-examples/src/main/java/dev/onvoid/webrtc/examples/WhepExample.java

ffmpeg push video to srs 25FPS
WhepExample pull video from srs
but WhepExample println 15FPS

Expected behavior
java code recevie 25fps

[skill7899]

Under the same environment, I tested it with Go or with web pull webrtc from srs and it worked without any issues