I have noticed that ever since upgrade to 14.04, when working with R, resizing a window triggers thousands of redrawing requests. This is able to kill off my session completely if the redrawing takes much time, as is the case with many complex statistical plots.
Is it possible to resize windows in current Unity using a wireframe only?
To control how the window manager (compiz) controls resizing requires a bit of poking around in the various gsettings values.
In particular there is the resize compiz plugin with a mode parameter which you can fiddle with.
By default it is set to "0" which is "Normal" and equates to whole window resizing
A value of "1" is enough to stop whole window resizing and switch to displaying a frame
A value of "2" displays a frame with a blur of the window border
A value of "3" shrinks the window during resizing: