I've recently integrated the ESRI Parcel Fabric local government information model into the Montana Rail Link GIS. In doing this I ran into a few snafus and came up with a few fixes that will be useful if you're trying to do something similar where the 'parcel' holdings aren't so neat and tidy, like those found in most cities and counties.
Railroads have right-of-ways adjacent to track center lines that were surveyed long ago in the late 1800's. If you think of these areas as parcels, than it would seem logical that they would fit neatly in a Parcel Fabric. Wrong! The Montana Rail Link right-of-way polygons were just way too big, they stretched for miles, even hundreds of miles in some places. The parcel fabric was designed to work for relatively small areas, like a city block and not huge linear expanses with thousands of vertexes. In it's defense, the parcel editor would work on the right-of-way areas, but waiting 10 minutes to move a vertex wasn't going to work. The solution was relatively simple.
Because I knew my desktop machine was bonking it's head recalculating the geometries of thousands of vertexes for each right-of way edit, I simply chopped up the problem into smaller pieces. I split the right-of-way into 1-mile chunks. So instead of having a right-of-way polygon that ran the length of 200 miles of track, it got split into 200 pieces along every mile post.
Splitting the right-of-way fixed the performance problem within the parcel editor, and now even a clunking machine can add and edit parcels within the Montana Rail Link parcel fabric.