Unfortunately I can't paste from UTFT.pdf.
But myGLCD.SetDisplay() is only applicable to CPLD displays.
The only ones that I know about are the Displays from ColdTears which are "similar" to SSD1963.
The ColdTears displays have an enormous RAM memory. You can draw a 800x480 picture to RAM. Then swap the display RAM instantly.
This seems a bit over the top for a Temperature display.
If you do have an external RAM chip (or Flash ROM), you can display a whole picture with pushColors(). It is not instant, but still pretty fast.
David.