D1 Mini V4.0 board is a big downgrade over the older V3.0 board.

[sblantipodi]

hello, I noticed that D1 Mini ESP8266 V4 board is a real downgrade over the older V3 board.

V4 board has No diode from VBUS to +5V.

However the implementation of USB-C on V4 could be significant in some applications. All previous versions included a Schottky diode from VBUS (on USB) to +5V. +5V feeds the onboard 3V3 regulator and the CH340 serial chip. V4 does not have that diode. So for instance with a V3 or previous, if you had a high current source for say WS2812B LED strings, you could connect it to the +5V pin to power the board, while still connecting the USB cable to your laptop, without risking back-feeding your laptop via the USB cable.

can you explain me why your removed such an important component? why no diode on the V4 board?

another downgrade I noticed consists in the memory speed.

I can upload an Arduino sketch on V3 board at 800kbit/sec, with V4 I upload at 150kbit/sec only. Any idea of the reason?