Last Month the Japanese try to retrive this mod a little bit more. They played in the at 2pm CET. At the moment the gametracker,com Server Monitorring is off. Hope soon they turn it on. The ranking seems to work.
The HD improvements shouldnt cause issues unless running on a rig that really did come out when bf42 was released. Kartman featured this longer view and cancelling of the terrain degradation at distance. Custom objects have no LOD settings.. they are mainly full poly all the time.
The BF engine starts to cause the lag before newer pc's feel the strain.
And you can always drop the settings in game if you experience a drop in fps.
I have a gaming rig but also a DELL Latitude D430 Laptop. It's got lame onboard graphics which cant run (wont even start) many games... but runs bf42 on the 'HD' settings without any problem.