Mattia Oss:
This can be seen in the 3rd video.
Lisi Reisz:
By you. Not by me - nor apparently by Felix.
It's really simple. It's the same size monitor. The "normal" characters are high resolution 24-bit colour graphics mode with 8*16 pixel glyphs, giving 240 columns by 67 rows. The "huge" characters are VGA text mode at 80 columns by 25 rows, giving glyphs that are in effect more than 24*32 pixels.
As for why graphics mode has slowed down going from simple-framebuffer to vesafb, consider this and its implications:
vesafb: scrolling: redraw