660m is a 5 year old laptop card that was mid-tier when it was released. The performance of laptop GPUs is usually around 50-60% of the desktop counterparts. In this very case I’d blame two things, the video card for the low fps and, most importantly, the hard drive which is very likely bottlenecking pretty much everything you’re doing. The 5400rpm units are notoriously slow. Solid state drive is almost a must if you’re looking for a comfortable working environment.
12GB or Ram is good enough unless you’re working with large textures and landscapes…
Could you confirm that you’re running a 64 bit version of Windows? Win+Break keys bring up system info.
The bottom line is, the editor is that power hungry.