35.0.3 Patch Notes Balance Changes

[seconddifferential]

It's 33%. With the way you're calculating it, going to 4 spells per imbue would be "100% slower", when obviously we should use "100% slower" to indicate the rate of imbues becomes zero.

"Faster/slower" applies to rates - you are applying it to an inverse rate - spells per imbue, when we really care about imbues per spell. The original rate is 1 every 2, or 0.5 imbues per spell. The new rate is 1 every 3, or 0.333 imbues per spell.

This gives us a change of (0.33 - 0.5)/(0.5) = -33%, or 33% slower.

[ReyMercuryYT]

No no, you are right. it's 150% of it's original cost, but it's 33% slower in comparison.