I'm converting some of my Flac files into mp3 at V0 vbr, using slow speed (Best Quality) and the Speed for single file is 54x. But when I convert a flac file to mp3 320 cbr, the conversion speed is 10x by using slow speed (Best Quality). Am I compromising with quality by using V0 vbr, if 320 cbr is more slower while converting. Please help! I want to keep on using V0.

I'm Using dBpoweramp Release 16.