Sustained Fire Rebalance

I just discovered that the Sustained Fire perks have been silently rebalanced (buffed and nerfed) recently (either in the 2.2 or 2.3 release; I suspect it was in 2.3 with the release of the Smart Minigun)

First, the buff; the rate at which the speed increases has been improved:

Perk Previous Speed Increase/s New Speed Increase/s
Sustained Fire 15.00% 25.00%
Improved Sustained Fire 25.00% 31.25%

Second, the nerf; the maximum speed increase has been reduced:

Perk Previous Max Speed Increase New Max Speed Increase
Sustained Fire 100% 75%
Improved Sustained Fire 150% 125%

Let’s look at the effective speed increase for different durations of standing still (italics is after reaching the maximum, bold is the higher value, some numbers rounded for clarity)

Perk 1s 2s 3s 4s 5s 6s 7s
Sustained Fire (Old) 15% 30% 45% 60% 75% 90% 100%
Sustained Fire (New) 25% 50% 75% 75% 75% 75% 75%
Improved Sustained Fire (Old) 25% 50% 75% 100% 125% 150% 150%
Improved Sustained Fire (New) ~31% ~63% ~94% 125% 125% 125% 125%

So if you stand still for 5 seconds or less, the new version is an improvement - so for most runs this is a buff. Only in Endless/Endless Boss/Dark Castle Runs where you have God perks and can stand still for long periods is this a nerf