At first, the perturbation expands within surrounding areas.

We even have good understanding of the initial conditions from primordial density perturbation spectrum.

Now, let's divide initial density perturbation, that's collapsing into a lot of thin layers.

Now, for the overdense perturbation, we can express the solution in a parametric form shown here.

This is more than what will happen in non expanding universe where only a factor of eight will be achieved because the surrounding background also expands while the perturbation collapses.

The edifice they have built will always fill their minds with perturbation (which will not cease) till their hearts are rent to pieces, for God is all knowing and all wise.

It has curves in two directions, one curve upward and opposite transverse curve down the other, so any kind of perturbation spreads the forces over the surface of this type of shape.

So far, we have seen how the nature of the initial conditions, as specified by the density perturbation spectrum, and the nature of the dark matter that determines the damping mechanisms, govern the formation of the large scale structure.