I am using a W25Q128 soldered to the Audio Board with my Teensy 3.6. As the erase() and write() tasks are very slow, I was thinking if the Teensy 4 helps at all in that matter. I think that the low speed is due to the own nature of the flash memory and depends only on the chip and probably the aswer is "no", but justo to corrobarate it.

Are there any compatible chips that are known to perform at higher speeds?

Thank you.