We have taken version 3.62 on board for the first release. Once version 4 is released we'll bring the EPOC version up to that level. Opera for EPOC is at least twice as fast as the existing browser, especially when it comes to graphics. With graphics we don't convert the JPGs and GIFs to the Psion source and we don't have to rely on the included libraries. Opera draws the graphics directly.
Opera is also faster at laying out text.
At the end of the day Opera is more efficient because it does not rely on the Psion libraries. Opera is in the game of rendering HTML pages so it just makes sense that it is what we do best. We will have a small upgrade and bug fix for the 3.62 version. The next release will display better on the Revo. Monospace fonts will now be available.