Thanks. I was able to get good results on the raw sector reads. I believe I've narrowed down the bottleneck to whatever is calling esp_vfs_read(). Even though I have some relatively large buffers, esp_vfs_read() is being called with 128 bytes as an argument. Would you be able to assist me in trackin...

I have tracked what I think are the performance issues down to: esp_vfs_read() is being called to read 128 bytes at a time, even when I am calling an fread(), requesting 50KB. I can't find where that 50KB request is being broken into 128 byte chunks. I assume its somewhere in newlib or the configura...

I am also curious on how to assign SPI flash to other pins. I'm looking to use 2 SD cards, one each on _0 and _1.

I am having similar results with fread(), roughly 1MBps. Would you be able to post the code you used for that test with the raw sectors? I'm curious if I get the same results.

Adam