Treat it like training, not a game.
Shoot for proper tactics and accuracy -- speed will come in the adrenaline dump of a real life situation.
I [i]always[/i] do tactical reloads before moving from cover. Some, more interested in their "score" leave cover with almost empty guns and clear corners with 2 rounds left. They have to do a slide lock reload standing in the middle of the doorway with 2 targets remaining. I have enough rounds in my gun to take care of all the targets.
I shoot a single stack 1911, so I don't have the advantage of 10+ round mags. I haven't used my Wilson Beaurocrat 10 round mags, though I might start to use it as a second mag this year.
I just try to stay nipping on the heels of the highcap guys and figure I'm doing okay (with lots of reloads).