Cores not being utilized effetctibely.

[GoogleCodeExporter]

When I have lot of dentical objects, and I copy paste bunches on them, the app 
freezes, and takes considerable time to get back. I then looked at how the CPU 
cores on my machine were being utilized. What I saw was that one core was at 
100%, while the other cores were less than 10%. This to me indicated that the 
application is not able to effectively utilize all the cores on my machine for 
better performance.

Can this be looked at?

Original issue reported on code.google.com by ratul.m...@gmail.com on 3 Jan 2015 at 5:08