I haven't paid attention to my climbing speed in a long while. I tend to have the computer displaying cadence and clock or distance most of the time, and pay more attention to keeping a high cadence on the climbs. I know I'm getting faster on the hills because I'm pushing the same cadence in a higher gear. If you want to be faster up the hills, just keep riding up the hills.
But at 6' 220ish lbs, whatever I lose in climbing speed I make up for on the way back down!