Freezing on Applying Material (Windows 64 bit)

Hello guys. When I try to apply a material(textures) my laptop freze between for 1-3 seconds. Actually sometimes this problem does not occur morever even it occurs it takes maximum 3 seconds(which is disturbing). The thing which I do not understand my laptop has 16gb RAM and 2gb Nvdia GTX 860m graphic card and 3.4 ghz processor. Actually it is gaming laptop. I think this system should be enough for unreal engine. Now guys any ideas about why this problem occurs?

Note: My graphic card updates is ok also Windows is updated and.