I think it probably is. The standard image works flawlessly with my 32gb SD card, zero freezing even if I transfer roms while playing PSX games using onboard bluetooth and wifi.
The only queston I’m left with is: Is this an issue with Berryboot itself or with Retropie or a little of both? I even went around the standard install and did Berryboot to a Raspbian and then installed RetroPie manually after stripping out X and all of the odds and ends. I’ll go ahead and add my voice to that thread though.