Why subtitles are so troublesome on jellyfin?

[thiagohds]

While I was using plex, subtitles were just normal. You could switch them on the go but with jellyfin each time you switch subtitles or select one to start watching something you have to wait for like 5 minutes for the file so start. Is this a problem with jellyfin or is something I need to configure so it can work properly? It happens with all kinds of subtitles except srt.