Magicka regen is reduced to 33% of normal in combat, if you must know. And thus this practically makes robes useless. I only wear them for the mage feeling, and because im playing on adept
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Again...not sure if this is because of your gameplay or not...but I just put my game at Apprentice last night because I was getting smashed by Forsworn Briar-Harts and Trolls (Mehrune's Dagon Razor Quest area)...but I've been playing the game at Adept till last night.
My spells have been fine, Ice Spike is usually a hard hitting spell, I could only imagine if I had Percs in the destruction tree my ice spike in two hands would fuggen one shot people like the mofo's for Sanguine's Tower (The Cryomancer) does to me almost every time...
Seriously, All mages I would suggest Conjuration and Destruction, don't go one tree. Use conjuration to deal with multiple people, use destruction to pick off people one by one, HEll the Flame Atronach EXPLODES When she dies, so I send that [censored] out first, let them beat on her till she is dead, she blows up, hurts them even more, I come out swinging for the cheap seats.
Again, this is as a Basic build, This is my first character so I have all my stats rounded, like each of my things is 220 atm.