The pace is sedate, painstaking, tedious even -- the reader is subjected to every walk down a hallway, note taken, candle lit, drink sipped, council meeting..... pages & pages of thought processes and inner monologues. It is very repetitive - beyond that necessary to join-up the three stories which were an omnibus here but originally three separate volumes.
However, that said, it was nice to revisit the world introduced in the "Heralds of Valdemar" trilogy and some of the characters introduced there. If you persevere, the tedium is occasionally broken by some exciting bursts of activity & intrigue, and the main characters do slowly grow on you, sinking into the mind so you can't help but read (and read and read) onward to see what happens.
The first "Heralds of Valdemar" trilogy was well done, a page-turner with action and suspense at every step, and the world-building unfolded effortlessly and naturally. This "Mage Storms" trilogy however was much more laboured and drawn out -- strikes me as one book's worth of material stretched out to meet a contract for a trilogy.