SUMMARY
When elisa is compiled with libvlc support, seeking or scrubbing with a shortcut is very laggy. If you do it quickly, the audio glitches out and it doesn't move around at all. This does not occur using vlc itself.

STEPS TO REPRODUCE
1. Compile elisa with libvlc;
2. Assign a shortcut to scrubbing and seeking (for example left arrow and right arrow);
3. Move around with those shortcuts while a music is playing. Do it quickly (or simply hold down the key);
4. Repeat, but now without libvlc support.

OBSERVED RESULT
With libvlc, moving around in the song with a shortcut feels quite laggy. Also, you can only do it 3 or so times per second; if you press the shortcut with a higher frequency (or hold it down), it just stays in the same place.

EXPECTED RESULT
It should be smooth, fast, and not laggy, like when it's compiled with QtMultimedia.

SOFTWARE/OS VERSIONS
Elisa: master
Linux: 5.9.11-arch2-1
KDE Plasma Version: 5.20.3
KDE Frameworks Version: 5.76.0
Qt Version: 5.15.2