https://www.mobileread.com/forums/sh...2&postcount=10
First, go to Advanced settings and tap fast a few times (beat 6-8 times with fingers) the Advanced settings caption at the top. You get a new setting: epub rendering engine, Auto, RMSDK or Readium
The second: make the same at the time, you can enadle and disble the performance logging. Watch the bottom of the screen for the message.
