With 4.3 hitting US servers today and the EU following tomorrow I thought I'd create this thread for raiding shadow priests to share insight on the finest details of how to maximise performance in each of the 8 encounters.
Please share any of the smallest tips and tricks you find that may help, whether it's survivability or DPS... or anything else for that matter. Even if it seems obvious to you if you think it may help someone throw it in here!
Examples would be, flying on alysrazor. During the burn phase get as close to the boss as possible so when you're knocked back you have less distance to run to pick up new feathers.
On ragnaros you can mindsear off a felguard (or other pet if it will be following the mobs) to AoE the molten elementals more efficiently.
The examples are t12 (for obvious reasons), please share anything you find in t13!