Opera has been slow recently because it's javascript engine lags behind firefox and particularly chrome. Opera has a relatively fast plain html renderer that slows when encountering Javascript moreso than other browsers including IE 9 which has a heavily tuned javascript engine (unlike IE 8). As for link desktop share it is generally agreed to be about 2% or 1/4 the share of Macintosh.

RealPlayer has mellowed it's act. The new version, RealPlayer 10 is advertising-ridden and tries to take over your filetypes, but tell it no and it actually listens.

On the Mac it runs great.