Fast or not compared to other browsers, I don't feel that is the important issue in the first instance.
I agree with jonix to have it first just working on RISC OS, and the big bonus I see is that we have Peter and his team at the forefront of RISC OS to support it's future.
I gave my pledge today and intend to help again. I don't think for one minute of my personal gains if I were to contribute, instead I realize the benefit for RISC OS and it's users.
To save time everyone, it may be a very good idea to "Pledge first, and ask questions later"?