This has been something more or less recurring when optimizing my mage with the arcane spec using rawr, but I reckon this last result was a bit over the edge. Here's the situation:
I'd been using the optimize feature of rawr to try and find better gear choices for my arcane mage, with thoroughness set always to maximum but using normal clicks. This always ended up finding a gearset with slightly less DPS than the starting one; strangely enough, no matter how many times I tried doing this, it would never return the same gearset, even though the starting one and the optimization options were always the same.
With this in mind, I decided to set throughness to maximum
and use the ctrl-click option to get the absolute highest thoroughness. Running calculations over 10 hours on my Windows 7 with Dual Core 2 Duo CPU, it finally found a solution... it went from the initial 25083,01 DPS to 22856,97 DPS, the biggest drop I've witnessed when using rawr.
Some gear choices were very, very weird. The weirdest included choosing
[Flamebloom Gloves] over
[Firelord's Gloves], dropping the 4-piece bonus in the process;
[Melodious Slippers] over
[Desert Walker Sandals];
[Belt of Arcane Storms] over
[Dreamless Belt];
[Hakkari Loa Drape] over
[Ritssyn's Ruminous Drape]; and
[Yellow Smoke Pendant] over
[Valiona's Medallion].
I reiterate those choices were for an arcane spec.
I don't really know if this is happening due to me messing up with any optimization options, but I don't think that's the case and, since I don't have much experience with programming, that's why I decided to post this here. If it's of any help,
here's a link to my character's armory: . If anyone here would like any other information you feel is useful to try and reproduce the problem/investigate the matter, feel free to ask.
Is anyone else having similar problems?