The loading time is reasonably awful in comparison with the MoM in dosbox. Performance in-game is awful as well. Really expected more from this rework of MoM :-/
I must admit there are lots of good new stuff: spells, units, retorts etc. But there are lot of really nasty things as well: 1) AI. Well that is terrible. It is either dumb as hell or super aggressive depending on difficulty. 2) Tactical combat is super dumb as well: like merging worms are retreating from bowmens to the edges of the map or flying units do not want to attack. 3) Rediculous artifacts in ruins. +1 orb of something with cost of 116 mana? seriously? 4) Myrran retort. Everyone become myrran in case you choose it. Standard wizards cannot be myrran on normal difficulty. So you cannot invade plane with another wizards anymore. that was so fun but you really ruined it. 5) It looks like in every single game there are wizards with same race or with same magic as you. Do not expect any "good vs evil" holy wars anymore. It would be really nice to fix these things.
