How do I send part of an ArrayBuffer to SPI

Thanks for sharing.

Yep, of cause drawImage() is always faster than drawString() with vector font.

Video post #4 is using setFont("6x8",4) because it is much faster than using vector and with option true no clear is needed, so this is similar to drawImage().

• drawImage() can benefit of spi_send_many
  
• lcd.setFont("Vector",20).drawString() looks like it is drawing pixel by pixel.
  
  

My conclusion:

• use drawImage when using vector font
  
• split your screen in small sections and use drawImage to update them