Quote Originally Posted by Sebazy View Post
Nono, slidecasting is the act of sliding in the final moments of a spell cast allowing you to get some movement in without dropping your GCD or needing to resort to an instant cast. You can slide cast Flare for all it's worth, it doesn't matter if the cast is longer or shorter than the GCD. What matters is you start moving before your current cast has finished.

It used to be significantly more important before healers had their nuke cast times axed across the board and it was borderline vital to have a good feel for this when playing a turret caster like old BLM and WHM back in the day.

Even now, it's still a great mobility habit to practice even on WHM as it allows you more options in conserving Lilies if needed or simply moving at a point where you don't want to refresh Dia. Watch pretty much any replay I've ever linked and you'll see me habitually shuffling around between casts if you're still not sure of the timing.
I feel that people sometimes confuses slidecasting with moving during the alloted time for your oGCDs. A BLM can move in both situations, second one is easier because you don't have that 'invisible gauge' to get a hang of.

Which reminds me, Squeenix could really implement a QoL feature like the WoW addon that shows the slidecast window in your castbar, depending on your latency.