[MC-74895] Speed and Slowness don't stack

The slowness and speed status effects don't stack

I expected that combining for instance speed 1 and slowness 1 would lead to a total speed boost of 5%

What happened was that the latest effect that was triggered was the only that had an effect on the game.

To Reproduce:
1. put this in chat: /effect <your name here> minecraft:speed <any number you think is long enough> 0 true
2. put this in chat: /effect <your name here> minecraft:slowness <any number you think is long enough> 0 true

Linked issues

duplicates 1

MC-10755 Effects with amplifiers over 4 (level V)/enchantments with level over max default value are not supported Resolved

Comments 8

Austin 2014-11-29T17:59:33Z

I actually tried this, you DO move faster, but it's hard to tell.

Victor Simon Duijff 2014-11-29T18:06:55Z

Try it with speed 10 and slowness 10, for me, I couldn't move

Austin 2014-11-29T18:29:25Z

Yeah, try using only slowness and speed 1

Victor Simon Duijff 2014-11-29T19:59:47Z

Then, isn't it still a bug when it doesn't work above a certain level?

kumasasa 2014-11-29T22:44:10Z

Effects over Lvl IV are not supported.

Victor Simon Duijff 2014-11-30T11:19:12Z

I've just tried combining speed IV and Slowness IV, you're still slower than before.
Edit: It seems slowness gives a higher debuff than speed gives a buff, is this correct? Is it supposed to happen?

kumasasa 2014-11-30T11:56:34Z

Slowness is applied after Speed:

Speed increases the speed 20 % per tier --> 80 % @ Speed IV
Slowness reduces the speed per 15% per tier --> 60 % @ Slowness IV

Starting at 100 %
--> applying Speed IV --> 180 %
--> applying Slowness IV --> 72 % (180 % * ( 100 % - 60 %))

But this is not a bug, this is coded deliberately that way.

Victor Simon Duijff 2014-11-30T17:40:01Z

Yeah, I realised that, just before you posted that. Thanks for clearing this up.