Oh, and by the way, is there any possibility to increase SPI speed? I'm running 16F886 @ 8mhz, and update rate is clearly not good - forget about scrolling letters and other stuff like that.
yes don't use shiftout, on a chip that has a mssp module it's an order of magnitude or two slower than spi
its like having a dog and barking yourself

Well, I already have buffer, but 32x1 pixels in size, because the data is sent to display line by line.
yet characters persist over 8 lines and you are ignoring that present data, furthermore there is no way to recover that data from the chip
you figure it out