after reaching 25% received from gear of any secondary stat, it will now take increasingly more rating to increase another % of that stat from your gear.
This means that if you have, let's say, 40% haste without Corruption, when the pre-patch comes, you'll only have 38% haste.
This penalty is as follows:
From 0 to 25%, there's no penalty.
From 25% to 34%, there's a 10% penalty.
From 34% to 42%, there's a 20% penalty.
From 42% to 49%, there's a 30% penalty.
From 49% to 106%, there's a 40% penalty.
You can't get more than 106% from gear rating.
To illustrate how this works, let's assume 10 haste rating gives you 1% haste.
- The first 250 haste rating you get will give you 25% haste, no penalties.
- After that, increasing your haste to 260, will only give you 25.9%, because any haste rating beyond 25% has a 10% penalty.
- This 10% penalty means you'll need 350 haste to get 34% haste, instead of needing only 340.
- Increasing your haste to 360, will increase it to 34.8%, because any haste rating beyond 34% has a 20% penalty.