1) Yes, I know, that's how long Firefox has been going down the wrong path, performance-wise. They've only recently seemed to kinda start addressing that ("now we're as good as Chrome, finally!" OK but Chrome is also bad, so....)

2) I'd prefer software just, you know, not be bad. Safari, for all its problems, demonstrates that there's nothing inherent in a modern desktop web browser that requires it to be grossly inconsiderate of your system resources.