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### Either max cdr or leave it alone...

ReasonGuy

Junior Member

I was doing a little math and found that, although I knew 100%cdr would give you 0 cd...
I never truly though much about that.

However I did some math and imagined a scenario...
Imagine a champ with no mana/energy/heat.
A champ with 0 casting time on all of their abilities.

This would mean that the effect of cdr would be more direct.
Imagine now, for simplicity that their skills are all 10 second cd...
Now take a 100second time to measure dps in.
Also just for simplicities sake imagine each skill does 1 true damage...

Now with 0 cdr, every 10 seconds he would do 1 damage... dealing 10 damage over the full 100 seconds.
100[timeframe] / skillcd = casts in 100 seconds...
Using this and the base damage you can figure how much dps change is going on.

Here is the result...
1%CDR GIVES +1%DPS
2%CDR GIVES +2%DPS
3%CDR GIVES +3%DPS
4%CDR GIVES +4.1%DPS
5%CDR GIVES +5.2%DPS
6%CDR GIVES +6.3%DPS
7%CDR GIVES +7.5%DPS
8%CDR GIVES +8.6%DPS
9%CDR GIVES +9.8%DPS
10%CDR GIVES +11%DPS
...
20%CDR GIVES +25%DPS
...
30%CDR GIVES +42%DPS
31%CDR GIVES +44%DPS
32%CDR GIVES +47%DPS
33%CDR GIVES +49%DPS
34%CDR GIVES +51%DPS
35%CDR GIVES +53%DPS
36%CDR GIVES +56%DPS
37%CDR GIVES +58%DPS
38%CDR GIVES +61%DPS
39%CDR GIVES +63%DPS
40%CDR GIVES +66%DPS

So the first couple of percents give about a 1-1%cdr to %dps increase.
However near the last 10 percent cdr, the dps increases go up to 2-3%.

Now remember this ignores casting times and skill costs, as those will penalize all cdr in a linear manner, essentially not effecting the curve of the dps boost.

This should tell you, that buying the first 10% cdr isn't that great.
But that last 10% is more than twice as good as the first 10%.

So in conclusion, if you're going to get ANY cdr, you may be better off maxing the cdr.
This counts for the mastery increases of 1-10%... and the runes which can increase the cdr even more.
Treat cdr like an addiction, if you're getting 1-5%, might as well get 40% XD

JustMyBassCannon

Recruiter

In theory, you're right.

In practice, I'd still prefer to shave 10 seconds off my ulti CD while getting ArPen on Wukong.

67chrome

Senior Member

Yes, it stacks exponentially with itself.

In practice you only need the amount of CDR for your abilities to be there when you want them though. Also, there's a decent number of abilities that grain reduced cooldown times with rank-ups, allowing you to hit the cap more readily. Usually I've found the first 10-20% CDR on Fiora is pretty crucial, but after that I can Lunge frequently enough and my ultimate is ready whenever I need to cast it that itemizing for more isn't that great.

Slash7

Senior Member

heres my suggestion how the cooldown reduction should work
100 cdr = cooldown / 2 (50%)
200 cdr = cooldown / 3 (66%)
300 cdr = cooldown / 4 (75%)
...
just like the armor method

TealNinje

Senior Member

If you're a mid mage or a tank top, you can hit max CDR with a single item (while investing heavily into the utility tree, which comes with both positives and negatives.) If you have per level CDR runes, you could probably hit max without investing in the utility tree, but you wouldn't have as much of an advantage early game.

Dinaverg

Senior Member

bonus points if you're Zilean

Snes C

Senior Member

My idea is this: make CDR increase the rate at which your spells come off of cooldown, instead of decreasing the cooldowns themselves. This puts it in line with other stats like attack speed which increase values instead of decreasing them.

Dark Kuno

Senior Member

Quote:
Snes C:
My idea is this: make CDR increase the rate at which your spells come off of cooldown, instead of decreasing the cooldowns themselves. This puts it in line with other stats like attack speed which increase values instead of decreasing them.

CDR takes the base cooldown on an ability and reduces it by whatever % of CDR you have

Attack speed works the same way. Attack speed takes the character's base time between attacks value (attacks per second) and reduces it by whatever % attack speed you have.