Why is PS4 media player 10-20 times faster than Plex media player on the PS4?

Recently I have switched from the Plex media player to the PS4 media player on the PS4. The main reason is that the PS4 media player is 10-20 times faster to start playing/fast forward/reverse for the same content coming from the Plex Media Server. Indeed, if I press 'skip 30 seconds' or 'go back 10 seconds' using the Plex media player, I sometimes have to wait 10+ seconds before it starts playing again. But on the PS4 media player, playing the exact same content, it starts playing right away (less than one second).
I wish there was a setting to solve this.