Warlocks and Cast Speed

[Surfy]

Okay, so I tried avoiding this thread but I failed to come to a conclusion on my own.

So, I timed my Warlock on how long it would take her to cast her 4 main offensive Spells using my normal Cast Speed gear which is 7% on Gloves and 13% on Staff. That's a total of 20% Cast Speed. This took me 10 seconds.

The second test was with shop bought items (No bonuses etc) and casted the same 4 Spells. This took me around 10.5 seconds. So the only thing I could conclude was that 20% Cast Speed gear would give you an advantage of around 0.5 seconds, if not any bonuses at all (Easily could of misscalculated 10 seconds from 10.5 seconds).

My question is: Does Cast Speed on gear really matter anymore or is this some sort of bug?

Thanks guys
Surfacing