Pre patch: I don't know I never bothered with it pre patch
Post patch: cast time 3.8sec (at lvl 10) and recast delay 7.2sec (at lvl 10)
Why: I think this kills the skill even though we are suppose to get damage increasing gears it still doesn't do enough damage to survive a mob and the after cast is really long if this formula was halved on both sides it would make this a more useful skill in top of the cast time already being bad and after cast delay you have to wear a phen or else you will get cancelled which makes it an even longer cast. Even in strings it is still a long cast time.
The Arrow Storm change opened a new "option" to Rangers, which is the "melee caster" build [being the main build for Severe Rainstorm]: 100+ DEX, 80+ INT, 60+ VIT, LUK or STR in a good amount. While we say the cast time can be high, it is just a non-specialized build. On that build, variable cast times can be around 30% of the real cast time, having a nice 1.3s cast on the skill, still not enough so you need a phen anyways.
In the other side, that reuse delay is ridiculously high. Both storms are slow. 4~5 seconds would be fair enough for Severe Rainstorm, and 2 or 3 for Arrow Storm because of the different means both skills hit.
Skill Name: Great Echo
Pre-patch formulas: 0.5s fixed, 2.5s variable. 10 seconds cooldown
Post-patch formulas: Only damage changed. Cast time and cooldown are the same.
Why this should be changed?
After the Severe Rainstorm nerf, Great Echo is considered the best damaging skill of a performer class. But not the most reliable, guess why. Because of the damn high cooldown. As I proposed to Arrow Storm on the comment of Dawei's post, a 2 or 3 seconds cooldown would make sense. Personally I would want one second, but I know damage would be absurdely fast. Well, the skill has around 2s total cast time after the DEX... The damage would be done every 4 seconds with 2 seconds cooldown, instead of 12 with the 10 seconds cooldown.
Another reason: This can be used as a bandage fix to the performers unability to level post-balance. iRO can change cooldowns and cast times as they wish. Lowering Great Echo's cooldown could be a way to revive performers way to level, and even "create" a WOE damaging function.