Here are some technical details about this demo:

- all glenz objects run in 50 FPS on a stock Amiga 1200

- no fake glenz vectors with two bitplanes and a tricky palette are used

- the blitter is mostly busy 100%, same for the cpu

- for a maximum performance the copper controls the blitter to avoid wait
  staits

- the blitter has full priority over the cpu

- all playfields for the glenz vectors use the 4x fetch mode

- bitplanes are aligned to 64 kB to initialize the blitter high pointers for
  each line drawing only once

- the background consists of 8 attached wide overscan sprites in 16 colours

- the sprites are repeated by sprite scan doubling
