I've noticed a weird change in game performance since the Indev 12 Unstable 4b update, it hasn't changed since Unstable 5.
Some quick computer specs:
Intel Dual Core 2.7 GHz CPU
6 GB RAM
256 MB AMD Radeon 2600 GPU
Before I installed the update for Unstable 4b, using the zoom caused the game to freeze for about 1/4 of a second before the zoom level would change. Also the game's framerate seemed proportional to the zoom level: when zoomed out framerates would be very low while zoomed in they were a lot higher.
After the Unstable 4b update, the lag when zooming is seemingly non-existant, however the behavior of the overall framerate changed. Instead of being proportional to the zoom level it's now sort of "capped" I guess at a lower framerate. I don't know how to tell exactly but it's probably under 20 FPS at all zoom levels and on any map (including the main menu).
I noticed that the game updated to java version 8 with the update, so I updated to java 8 (I was using java 7), and nothing changed.
I don't know what else to say about it, there doesn't appear to be any weird things in any of the logs.