I have a complex object in Blender (about 336,000 vertices) to which I'm trying to apply modifiers. A smooth modifier is pretty quick, but a laplacian smooth takes a really long time. I have to wait about 5 minutes every time I change one of the settings. If I click any button during this wait, windows says 'blender (not responding)' and the screen gets grayed out, but after some time it actually manages to process my change.
I would understand this slowing if blender would say, overfill my RAM, or max out my GPU, but this is not happening. I cannot find where the bottleneck is.
I'm on Windows 7 Professional 64bit with intel core i7 3.5GHz, 32Gb of RAM, and I use a Nvidia Geforce GTX 750 Ti. Whenever Blender is stuck, I see no changes in CPU usage, GPU load (as monitored by Techpowerup GPU-Z 2.7.0), GPU memory used, GPU temperature. Blender's memory usage goes up slightly, by less than a Gb, but it's nowhere near maxing out.
If I were to upgrade my PC to make this process faster, which part should I upgrade?