Download the newer Aweb APL version 3.5.01. One of the "bugs" it lists as fixed is unneccessary screen redraw. You can find a link to the APL site from
www.amitrix.com.
I've also noticed that similarly configured machines behave differently with AWeb when using either Picasso96 and CyberGFX. I need to look into it a little further, but I'm sure one is worse than the other.
Adrian