Im not 100% on this, but im sure they have really done something to the way buildings in the distance are rendered. Before Apex released, i noticed that when i set objects to low detail, the buildings in the distance would lose geometry quality, and increase when the ultra setting is used. But since release, if i have Object detail on low, the buildings in the far distance still seem to be rendered in the same way as if you have the ultra setting on. (The foliage still alters in quality as you would expect, but any arma player knows its the buildings that really kill fps.)
Before apex i can remember gaining something like 15 - 20 fps switching from ultra to low object detail when in a large urban place (kavala for example)
Im not sure if this is intentional or not, or if i missed something in the patch notes (sorry if that is the case) but any information would be gladly appreciated!