I thought the point of the classicwb packages was to offer the best WB experience on a given machine. They do contain addons but also optimizations to make the system run smoother. Such as an option to free more mem at boot.
Anyway the target system specs are as follows
ClassicWB OS39
ECS, 3.1 ROMS, 68020, 6MB RAM, 200MB Hard Drive
TV/Monitor (Designed for Multisync/Interlaced 640x512)
GlowIcon System - 16 Colour Screenmode
Target System - A1200 with accelerator, ROM and memory expansion
I only ever really noticed slowdown on redrawing lots of windows or in folders that contain lots of files. So maybe it's down to the fact i am using ECS and not AGA?