It just takes longer, which is not so relevant to people who consider it takes too long in any case.d20 mechanics suck for this because it's very difficult to extrapolate from the strongly tied individual combat rules to a group combat.
I would call that stuff, not "the magic system".The second issue I had was the magic system. It was just so incredibly overpowering that it wasn't fun. A lyre of building makes your ship invulnerable to damage for an hour (longer with chances of mishap). An extended wand of fireballs has a range of almost half a mile.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.