I've been impressed by how many Mac bugs have been addressed in these betas, though I don't think any of them are issues I've ever (knowingly) come across. There had been some indication that the 4.6a cycle would include some fairly impressive improvements to the Mac, which in the context of the discussion (the various threads over the last couple of weeks addressing Mac issues) seemed to indicate performance improvements. So far, though, in my own experience there has been no real difference between the beta and prior versions. Are performance improvements coming, or did comments about improvements in 4.6a talking about the various bug fixes?
Really, really wanting to see improvement.