Drawing a line being slower is actually pretty confusing since the system should be able to recognise flat lines and turn them into fillrect commands.
I feel like the big issue here is really just the LCD driver and being able to push data fast enough.
Do you think you'd be in a position to build your own firmware? I know you're on the Amperka board and I think their builds are some way behind Espruino - however if you could build your own firmware there is actually a native SPI LCD driver in https://github.com/espruino/Espruino/blob/master/libs/graphics/lcd_spi_unbuf.c
If you could include that, suddenly updates would get miles faster
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