Take it as a given that bosses on heroic will, in general, have more hp and their abilities will do more damage. Strategy wise the encounters are relatively the same. In order to have a better chance of taking down bosses on heroic difficulty the raiders will need to know exactly how all the encounter’s mechanics work on normal mode and then optimize their play for the heroic version.
Over the next few weeks I’ll be adding videos of some of the best guilds in the world fighting on heroic difficulty. I’ll select a certain video based on the strategy presented, the way the player moves, and the music involved.
Below the video I will add short notes about the differences between heroic and normal versions, as well as methods to optimize your play for heroic.
Quote from: Nerimash
Some highly populated realms, as well as some realms in highly populated Battlegroups, are currently experiencing performance issues during peak playing hours, which, depending on the realm, can occur both inside and outside instances. This is caused primarily by high concurrent Icecrown Citadel activity, the start of Arena Season 8, the release of the new Vault of Archavon boss encounter and the “Love is in the Air” seasonal event.
To help address some of these issues, we’ve applied a hotfix to optimise certain database requests during the weekly maintenance, in addition to a variety of other related adjustments. We will continue to monitor the affected realms and will be making further adjustments to continually improve performance where possible. We know the performance issues have been a frustrating inconvenience for the players on these realms -- we very much appreciate your patience while we implement additional short- and long-term solutions.