Hi Fizzy: A second vote for FBlit. Also, you may want to use LoadWB SIMPLEGELS in your Startup-sequence ... from the 3.9 FAQ:
Q: What does "LoadWB SIMPLEGELS" do?
A: It reverts the system to the old OS 3.1 style of selecting and dragging icons, which is solid icons and positioning one at a time. The new OS 3.5 way is greyed or dotty icons, and positioning all at once. On my A1200T, SIMPLEGELS prevents the 300K Chip RAM loss when using FBlit and WBCtrl on AGA. [Michael Rye] Note: Robin Hueskes reported his system (using a BVisionPPC with CGX4) was very unstable until he used the "SIMPLEGELS" option, so if you are experiencing problems you might give it a try, even if you're using a graphics card.
My .02 ..