The change (as it is) is currently not planned to be applied to the main server. This is due to the buggy nature of the OSI casting mechanics and the almost definite negative impact it will have for everyone.
The change, specifically, consists of:
- Spell timer priorities have changed to mimic typical OSI delays in spell casting. This effectively means your spell casting time can take up to 250ms longer than technically required (as opposed to 25ms before this change).
- Casting a spell within 250ms of your last spell will "break" the spell. This is very buggy behavior that occurs on OSI that effectively means you cannot cast spells in fast succession. A "broken" spell will appear to cast fine initially (showing the words of power), but it will not lead to a target, will not block movement and will only show 1 casting animation, but it does block casting a new spell until it finishes completely.