Quote Originally Posted by Padudu View Post
I think I will have to look into clipping exactly and making sure I don't do it, same token of slidecasting
In case you don't find good resources:

Slidecasting is what initially appears to be either a bug or a side-effect of laggy netcode, but has been confirmed in interviews with Yoshida as an intended feature. When you hit around the last 0.2-0.1 seconds of casting a spell (you get a feel for it over time), you can move and still finish casting. This lets you move early while still getting your spell off.

Clipping is delaying your GCD. The vast majority of your efficiency (damage or otherwise) comes from keeping your GCD on cooldown as often as possible. One of your abstract goals is to ensure that every encounter includes as many GCD uses as you can fit. This means prioritizing starting a GCD cast immediately after it finishes cooling down. If you don't, that delays your GCD, eventually losing you casts over the course of the fight. Off-GCDs are used in what we call "weave windows". As long as a GCD has a cast time shorter than its cooldown (for example, Ruin 2 is instant cast), you can fit off-GCDs in that time period without losing any GCD uptime. This comes at a marginal cost though; every oGCD has a short animation lock that gives them a mandatory usage time. If you try to fit too many oGCDs during one of these weave windows, you end up spilling over into the time that your GCD has finished cooling down, and delaying it anyway.

In order to use oGCDs in a way that doesn't cause you to clip your GCD, you can safely use up to two oGCDs after an instant cast, or one after a short-GCD cast (like Broil). I think it's theoretically possible to triple-weave after an instant GCD if you have the best ping in the world, but I've never seen anyone close enough to the servers to manage it outside Japan.