I already mentionned this in the topic dedicated to the various bugs of FE but I know now that multitasking (sort of I mean) is the culprit here.
My configuration : AmigaONE X1000-2GB Ram and a Radeon 9250 128 Bits plugged into the highest PCI-Express slot with a dedicated 66Mhz PCI<->PCI-E Adapter (do not ask why I use a Radeon 9250 instead of a Radeon HD, this is my choice regarding this specific subject

Let me explain : with Update 6, I used to have numerous dockies enabled (SmartDock, NetDock, RAMDock, GFXDOck, CPUTemp.docy, X1KTemp and so on). there was also Dnetc and Limpidclock enabled (the latest with a priority of -36). Everything was working fine with no slowness at all.
With the Final Edition, whenever only ONE docky is enabled, the mouse becomes jerky when the CPU is fully loaded with multiple threads and it's pretty unusable. Since Odyssey is really demanding in power resources, surfing has become very difficult since then.
I've taken much time to guess where the problem came from and finally decided to test without the dockies. Well not only the dockies but everything that run in background cas the mouse to become jerky.
Juste to show you what happens (just look at the mouse pointer) :
Without anything running in background : http://youtu.be/fR1wcU-Wu4U
With only CPUTemp.docky : http://youtu.be/riFL2KyDy0Q
Could the new DMA improvments in graphics.library be the culprit in a way or another ? Today, all my dockies are disabled. So I do only one task at the same time. Not really nice for a multisaking system.
BTW : no problem of that sort on the Sam440.
Any idea ?