If your grinding instances, I would suggest running a combat log, and uploading it to wwstats or whatever your favorite place is. Handling procs (especially haste) and movement would be the big advantage here.

Zoning into naxx10/25 depending on how your geared and burning on some Gargoyles works nicely since they go indestructible and have actual health.

Fwiw, they will reset if you step back right at the entrance ring which is nice to know when your working out macros and mess something up (like healing, jamba didnt sync, etc)