Thanks. I actually added an option on my local CLI, -s --serial-block-size. I can send you a pull request if useful. I found that on the ESP32 128 works well enough.
I would like to look at what is involved with this, as I need to use throttle on send when using the linux espruino build on telnet on the web ide. If throttle on send is off:
New interpreter error: FIFO_FULL
I would like to get an idea about where to increase the buffer size to 128.
When throttle on send is used, it is overly throttled, so would be great to be able to tune this.