Summary: We discuss semiclassical quantization of closed superstrings in \(\text{AdS}_5\times S^5\). We consider two basic examples: point-like string boosted along a large circle of \(S^5\) and folded string rotating in \(\text{AdS}_5\). In the first case we clarify the general structure of the sigma model perturbation theory for the energy of string states beyond the one-loop order (related to the plane-wave limit). In the second case we argue that the large spin limit of the expression for the ground-state energy (i.e. for the dimension of the corresponding minimal twist gauge theory operator) has the form \(S + f(\lambda) \ln S\) to all orders in the \(\alpha^{'} \sim 1/\sqrt{\lambda}\) expansion, in agreement with the AdS/CFT duality. We also suggest the extension of the semiclassical approach to near-conformal (near-AdS) cases on the example of the fractional D3-brane on conifold background.