CPU cranks to 300-600% and overheats when subtitles are turned on

OK gang,
with what we have gathered here, and over here:

Plex Media Server process uses 100% cpu

I have had a direct chat with the engineer.

What would be nice:

  1. XML of the file which demonstrates the problem reliably when playing to Plex/web.
  2. DEBUG logs only, VERBOSE logging off.
  3. Start Playback.
  4. Skip forward (if subs don’t start for a while) until where it subtitles are visible on the display.
  5. Now let it play for 60 seconds
  6. Stop Playback
  7. Wait 30 seconds.
  8. Download the logs (Settings - Server - Troubleshooting - Download Logs)
  9. Attach the XML and ZIP file here