How much dps does haste add?
 

Is 10% haste a net increase of 10% more damage? Or does it scale higher/lower than that?

Are there any charts that show how haste effects damage?

On average, you will be hitting 10% more, and assuming you didn't gain more STR, DEX (for procs), skill points, or levels, your average DPS will go up by 10%.

Yeah, if you're starting out as a melee, the FIRST thing you need to buy is Silver Chitin Hand Wraps when you get the plat. Huge difference.

(Except maybe bard)

Which is another reason why even a small jump from something like FBSS to Sash (3% haste difference) is worth the 1k-2k price you'll pay to make the upgrade.

As far as I've ever known haste is pretty straight forward in that a 10% increase would in fact be a 10% damage increase.

Keep in mind there are haste caps and you will be caped even with low level haste items until late 50s if you are grouping with enchanters/shmans

Not quite but it's probably close enough to not make a difference. Haste lowers your delay by a percent, which means slow weapons get a bigger damage boost than faster ones.

They would get the same % boost....

Yeah but haste cant get you lower than the delay cap right? Is that a limiting factor for haste here?

Here's a 2006 post that should be mostly relevant. Assuming the P99 devs kept server ticks the same, minimum effective delay, after haste, would be 7.8.

No, they wouldn't. Haste is a reduction in your attack speed/delay. it's not a raw"damage boost" . 20% haste doesn't boost your damage by 20%, it reduces your delay by 20%.