Warframe Fire Rate Mods
There are three mods in Warframe which increase your ability to take bullets in your inventory and put them into enemies faster: magazine capacity, fire rate, and reload speed.
Magazine size / Fire rate = time to empty
Time to empty + time to reload = total cycle time
Damage x bullets in magazine = Damage per cycle
damage per cycle / Total cycle time = damage per second.
Magazine capacity increases both cycle time and damage per cycle since it increases the time it takes to empty the magazine. Make sure you pay attention to rounding for magazine size. Sometimes adding more points to a mod won’t actually raise the number of bullets in a clip. Check the wiki: Primary, secondary, shotguns.
Generally, the larger the magazine and the slower the rate of fire, the better bonus you will get from a fire rate mod. Likewise, the longer the reload speed relative to how long it takes to empty the magazine, the more important a reload speed mod is. So, if most of the cycle is taken up firing, such as with the Burston, use a fire rate mod. If most of the cycle is taken up by the time spent reloading, use a reload speed mod first, like with the Broncos or Vipers. Notice that mods build on each other and you can’t just add up the additional percents to get the total benefit.
Weapons with very long reload times can benefit from a reload mod, because getting staggered, opening a locker, or doing some of the acrobatics can restart the reload timer, which can result in having to reload several times. Although reload mods look underpowered in these charts remember two things. First, reload mods are cheaper than the fire rate mod and you might reload half way through the magazine. The numbers assume you empty the full magazine every time. If you compulsively reload after every enemy, the reload speed mod is your friend.
All of these mods reduce the time it takes to run out of ammo. In missions where you find yourself running out of ammo more quickly than you’d like, it might be worthwhile to use more elemental or crit mods instead.
Primary weapons have the worst fire rate mods of the 3 mod types, topping out at 30% magazine size, 60% fire rate, and 30% reload speed. Magazine warp costs 9 mod points for a measly 30% clip capacity.
Shotguns have the best fire rate mods out of all the weapon types, with 90% fire rate, 60% ammo capacity, and 30% reload speed.
Secondary fire rate mods are somewhere between primary and shotgun mods in effectiveness. Pay close attention to the wide variety of bonuses for the various mods. Some weapons benefit a lot from fire rate (kunai), some from magazine size (broncos), and some from reload (twin vipers).