Ed, now I think that there's something special about your FPZ image that is not outlined in your instructions. I have tried three images now including the stock 4.3 image directly from the Retropie website. The only change I made is the ssh file and wpa_supplicant.conf, and editing the config.txt to add the FPZ. All of them boot up with a white screen and never progress further.
Just flashed the original 4.2 FPZ image. No roms transferred yet. No slowdowns. Now updating to 4.3. Let's see what happens. Just curious, have you run any FPZ units on 4.3?
Update: transferred about 50 roms over across 4 systems and still no slowdown. The good news is the speed issues are gone on this fresh install ... so far.
Just flashed the original 4.2 FPZ image. No roms transferred yet. No slowdowns. Now updating to 4.3. Let's see what happens. Just curious, have you run any FPZ units on 4.3?
Update: transferred about 50 roms over across 4 systems and still no slowdown. The good news is the speed issues are gone on this fresh install ... so far.