Im using LE on a RasberryPi3.
I saw that comming Something must have changed in the Videoplayer from Alpha 2 to 3. I don't know what it is, but I got the same problems when I tested milhouse builds over last month. In Alpha 2 there were no problems. Now since Update (as in milhouse biulds) I get annoying frame drops (first 30-50 seconds until it gets stable) when I start certain streams:
If you are interested you can reproduce it by using the SouthPark Addon from KodiRepo and RocketbeansTV Addon (/Twitch-Stream) from Kodinerds Repo, and you should see what I mean.