How do Haste effects work and stack in Dbd?

BlueHorkew

There is 2 question in this post:

First- How do Haste effects work in Dbd? For exemple MFT, do you add 3% to your 100% speed or do you multiply you base speed by 103%

Second- how do multiple Haste effects stack, are they addictive or multiplictive?

Again 100% + 3% from MFT + 7% for Hope or 100 x 1,03 x 1,07

This also makes Haste perks have different values for killer, because of their base speed, if Haste is multiplicative 115% killers benefict more from the extra speed

Also do speed add-ons also follow the same logic as Haste effects in how they work and stack?

Seraphor

All positive effects are additive, so 3% + 7% = 10% faster

Each 1% of movement speed is 0.04m/s.

Survivors at 100% are 4m/s base, 10% faster = 110% or 4.4m/s

Killers at 115% are 4.6m/s base, 10% faster = 125% or 5m/s

All negative effects are multiplicative, so -20% and -10% = -28% total

This is so positive multipliers don't reach infinity and negative multipliers don't reach zero.

mizark3

Its a mix of additive and multiplicitive. The perk/add-on numbers are tallied up, so MfT 3% + Hope 7%, then the 10% is multiplied onto the base 100% for 110%. For Killer with 3 Play With Your Food stacks, this is 15% multiplied onto 115%, or 132.25%, not 130%. As mentioned above negative numbers also apply the multiplicative method, which also works with combined numbers. This means an MfT and Hope 10% against a Forced Hesitation 20% + Clown Bottle 15% puts Survivor at (FH)80%->(CB)68%->(MfT+H)74.8%.

The main part that confuses people is Bloodlust. Bloodlust isn't a percentage bonus, it is a static .2m/s/tier. People often refer to Bloodlust as 5% boost, but technically it isn't a haste effect (no Haste status symbol on the side). Mathematically .2m/s is an additive 5% for Killer but only in relation to Survivor 4.0. A Hag going from 4.4->4.6 goes ~4.5% faster, and a Legion going from 4.6->4.8 is going ~4.3% faster.

Devil_hit11

https://forums.bhvr.com/dead-by-daylight/discussion/comment/3501354#Comment_3501354

I am pretty sure all of them are multiplicative by base value. survivors move at 4.0. so 4.0 x 1.1 = 4.4. 4.4 is 110% m/s. killer move slightly faster so 10% for killer is 4.6x1.1 = 5.06. to convert movement speed into %, you need take raw number of 5.06 and divide by 0.2. every 0.2 is 5% movement speed. in this case, 5.06/0.2 is 25.2. now you multiply 25.2*5 and you get 126.5%.

a killer affected by 10% haste modifier will get 11.5% speed boost.