Sending code to ESP32 slow using EspruinoTools -- says "Set Slow Write = true"

Hmm well so far not so good...

New interpreter error: FIFO_FULL
>Guru Meditation Error of type LoadProhibited occurred on core  0. Exception was unhandled.

Get this error on second transfer -- every time. Interestingly this doesn't happen with all code. If I create a simple hello world app I can change it multiple times no problem and the transfer is ok.

Could be something to do with code size or maybe something about my app itself (it has a heavy interval timer).

EDIT: I assume ESP32 serial over USB is less capable flow-control wise than the Espruino Pico and this is simply a buffer overflow issue. I played around with the slow serial block size in the code and found 128 bytes to be a happy medium between speed of transfer and stability. Default (slow send) is 19.