There is a thread about this on the Mediator mailing-list, but I cant find it. It was 6 years ago I bought a four slot Mediator for the A1200. Sold it in under 1 month lol.
Lol.. whats the point of having a mediator if some ****ty Warp 3D game runs smother and WB runs slower 
If you could find that thread it would make an interesting reading. Hey, this is a hobby for me and the W3D games are a part of it

. And my WB runs very smooth, I can make a video of it. But I don't claim the Mediator design hasn't got flaws, but that's something we have to live with since there's no real alternative... :/