I have installed the 4.3 update last week, by updating only the client, as usual. Everything went smooth, just like the previous updates.
I'm not interested in the small scenery fixes in the scenery update and I really, REALLY don't want to download several GB just for these small fixes.
I might be interested in the new airplane (Captain Sim C-130) and the various updates to the default planes in the "content" part, but I'm really not motivated to download the 2 or 3GB content files, so I haven't done that yet.
My computer is now way too old for P3D. I can get decent/good performance (30 to 45 FPS) as long as I stay away from large airports or complex sceneries, with a very good graphical level, but that's it. Some planes I cannot use because they are too heavy for my CPU (Justflight Tornado, Aerosoft Airbus, any complex airliner...). Some sceneries I cannot use for the same reason (any complex airport, FranceVFR sceneries with 3DAutomation autogen etc...).
In that context, the 4.3 update didn't really bring anything positive on the performances level. It runs more or less just like 4.2 did.
As far as I understand, the performance increase might happen on more powerful/recent CPUs and video cards, because for example, the FPS impact of the dynamic lighting has been reduced. I cannot activate this option because it brings my FPS far too low. Even with the patch, there is still a small impact, and I don't need that
Users of VR headsets will also see drastic FPS improvements.
The new computer has arrived, fortunately
But it's still in its box, and I'm still away from it in business trip, unfortunately
In August I may have time to switch.