Dan
Ok. So you are transferring to SPI RAM straight away. As Pclock is only around 1 MHz , it should be possible to transfer to SPI at that rate, ie you'd need SPI speed set as fast as possible, as its going to take at least 16 cycles per byte using DIV2
I will try to get back to my ov7670 test rig and read the low res image straight into internal ram, and then I will need to write code to rotate and then write to the LCD, as the ILI9341 display I have is portrait but the camera is landscape