Distribution of rotation support, $\mathcal{R}={V_{\text{rot}}}^2/{V_{\text{c}}}^2$, for clumps in high-redshift massive galactic disks, based on zoom-in cosmological simulations (Ceverino et al. 2012). Shown is the distribution over the clumps of circular velocity in the range 50 − 250 km s⁻¹. The median of ℛ = 0.79 is marked (red). The values that exceed unity are indicative of the error that should be assigned to the ℛ values. We note in comparison that the Galactic globular clusters are hardly rotating, typically with ℛ ≪ 1 (Sollima et al. 2019).