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@MarkusGritsch
Hi,
I was surprised to see that the SPI approach actually worked for you, so I tried it too. The timing diagram with a logic analyzer shows, that it is barely working. The gap between the individual 4 bits is about 5,5 µs, which is on the margin of latching the sent data into the LEDs. The gap after the first byte is about 11 µs which explains the first dummy byte you had to send.
In your code you specify mosi:D15 which is of no use and a bit misleading, as MOSI in the ESP8255 is hardwired to pin GPIO13. But as already said it is not evaluated anyways.
Further, I saw no difference in the timings whether using the setTimeout call or not. Both produce the same output for me.
Finally, I verified that esp.neopixelWrite() still works fine.