Stefan,
In my job we dont use any of the iFeatures to create our geometry. But I recently ran some benchmark tests for a friend of mine from another company that compared model creation using (1) iFeatures/punch tool, (2)hole point, (3) sketched geometry. The test only addressed (a) opening the assembly, (b) making a change to one piece of the assembly (deleting one of the first 3 options, (c) saving the assembly, (d) recreating the with the original method, (e) then saving assembly again. Doing this with all 3 methods, sketched geometry was the fastest, hole point method was about 20% slower, and iFeature/punch tool method was .....lets just say that the first 2 methods took seconds to update with each change of save and ifeature/punch tool took minutes. Just some info to try on your own test. Mike