One place I see people loose time; when shooting from cover and having to do a reload.
When they run dry they move back behind cover to do the reload.
3.8.6. When reloading behind cover a shooter does not have to duck back completely behind cover to reload before reengaging targets from a stationary firing point. The shooter may keep his eyes on his next threat as long as he is in cover and does not expose more than 50% of his torso or any of lower body/legs/feet to the next threat target. For vertical cover, at least 50% of the shooter’s torso, as well as 100% of the shooters legs and feet must be behind cover. Low cover is the same as vertical cover and requires at least one knee touch the ground. For a combination of low and vertical cover, e.g. a barrel, the shooter’s legs and feet must be behind cover and at least 50% of the shooter’s torso must be behind cover; however, simultaneous exposure of the shooter’s torso above and around the cover is permitted