... Much Pro, much contra ...

The fact is, the new Lightroom provides a more accurate processing of files that regulators operate in its new constellation better delineated. Especially for those that depend on the individual processing of images, here are their joy, it leaves quite something get with a little patience of data that you would normally declared lost.

So up to this point really succeeded. Who does not need the changes times, enters the old process.

Now for counterpoint and that is the performance much described bad.

I have to stand a X6 with 16GB RAM and 6x3,8Ghz here. The system builds on SSDs, so everything as it will bear the current technical state.
Only it going anything. LR4 hardly uses memory, but only read and write, it is bad summoned, everything is slow on. The realtime LR3 is a distant memory, the cores are bored. Most just 1-2 cores are busier.

It is interrogated by LR4 no power when the computer while it hooks insich, pops zeitweilich then also, or go to any feedback.
In my mind, a completely unstable program, which does not get beyond a beta status.

The LR3 variant from the beginning was stable and rasent quickly.

There is only one time when LR4 runs on top form and that's when you export, all cores are fully utilized. One can even halfway continue working.

From me there for much beta only 3 star, it just has to be properly done what ....