ember fusillade

while casting reduces walk speed
while holding down ember fusillade makes you walk very slow
you can bypass this by clicking the spell, charges the spell just as quick but with almost no reduction to speed (with high cast speed).

i think this spell would feel better if the walking speed reduction be lowered by the amount of cast speed?

It also needs a massive cast speed buff, if you have to wait for all the projectiles to fire you should at least be able to get up to max faster. Cast speed buff would not even increase dps, just make it feel better to use.

You can use Scattershot to get that "cast speed buff". You charge 3 per "cast" instead of 1. So despite the -20% casting speed, you wind up casting faster. And since each shot deals more than the one before it, the two extra shots it provides offset the -20% damage more than usual as well.

The tooltip will tell you it is a 36% or so drop in DPS, but that's because it isn't doing the math right, too many variables.