Can't beleive I used to write this stuff...

Tim. Yeah I learnt ASM on Spectrum, BBC and C64 and of course Amiga 68000 (was the best) as a teenager.

Here are some exes first one is assembly, second is C. Hold R to see a raster. The red is Video time and the green is CPU time. You can see the ASM version used less CPU time.

http://www.jbcomputersolutions.com/misc/oldexes.zip