SPI communication is very slow

[siteswapjuggler]

Hi there I'm working out with a 128x64 SSD1306 Oled breakboard configure in SPI. I'm quiet suprise by the overall slowiness of the library. The display() method seems to take more than 24 ms to execute where it should take less than 2 ms according to the 8 MHz speed declared in the library.

Do I miss something somewhere ? is there a way to speed up things with this library ?

Tested on Arduino Uno and Arduino Pro Micro.