Originally Posted by GoG
If in the course of a lengthy fight, when you are trying to keep all your dots up as close to 100% of the time as possible you get into this scenario:
(pretend this an accurate picture of your dot timers  )
1.8 sec Corruption on Blah
1.5 sec immolation on Blah
This might not happen as part of your "perfect" rotation, this might not be ideal, but this will happen. What do you do? In theory, you want to start to cast a new dot so that it goes off just as the previous cast of it falls off, but in this scenario you have 2 dots that are going to fall off very close to each other and its impossible to start to cast them in such a way to have no down time, unless, of course, your corruption in an instant cast.
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Calculations of DPS loss from small overlap effects in DoT rotations indicate that this just isn't a problem.
The Warlock (another) DPS spreadsheet thread shows the following, roughly:
2 seconds of DoT Gap for ALL dots (meaning, you get to refresh each 2 seconds late) loses you the same ammount of dps as 0.1 second of Lag -- about 2%.
I would never go without instant corruption unless I have 0 points in the tree, but DPS loss from minor DoT uptime loss is minimal. DPS loss from not casting is huge. So as long as you are continuously casting SOMETHING and keeping all dots up as much as you can, you're doing good. If you cancel a shadowbolt (or even drain life) half way through to get your corruption back up in 'prefect' time, you're losing dps.
Yes, talented corruption + Immolate make a very nice pair in a cycle though (Corr > Immolate -- both end at the same time, can be refreshed in the same cycle continuously -- UA > Corr > Immo as a triplet with one immo tick loss per cycle is optimal).