Another complainant here. Frustrating thing is that it seems to be using less memory and I can't see it hogging any resources.
Just clicking a layer on and off takes too long to see the comparative difference. That's in a 10 megapixel image with just three layers in it.
Adobe Photoshop Version: 2014.0.0 20140508.r.58 2014/05/08:23:59:59 x64
Operating System: Windows 8.1 64-bit
Version: 6.3
System architecture: Intel CPU Family:6, Model:10, Stepping:9 with MMX, SSE Integer, SSE FP, SSE2, SSE3, SSE4.1, SSE4.2, HyperThreading
Physical processor count: 4
Logical processor count: 8
Processor speed: 3392 MHz
Built-in memory: 16344 MB
Free memory: 10758 MB
Memory available to Photoshop: 14578 MB
Memory used by Photoshop: 70 %