Problem: Subtitles always transcoding (how to direct stream SRTs to Android?)

As the title states, whenever I stream something from my PC to my Android phone, if I turn on the subtitles Plex will transcode, which results in high cpu usage and a toast message on the Android saying something like "server not fast enough".
I google and tried everything I could find for days and the only thing I have left is to ask, hoping for some "personalized" help.
Any help would be greatly appreciated.