(In reply to Jan Matejek from comment #4) > (a clarification, when i say "line by line", i mean scanlines, as in > individual pixels. not lines of text) > > it very much looks as if a pre-filled 2560x1440 buffer is copied on screen > and that takes a long time. That sounds like no dobule buffering so that the rendering direct updating the on-screen buffer in video memory, blitting data from system memory to it.