  We study the Schr\"{o}dinger-Poisson-Slater equation $$-\Delta u +
u+\lambda(I_{2}*|u|^2)u=|u|^{p-2}u\quad\text{in $\mathbb R^3$},$$ where $p\in
(3,6)$ and $\lambda>0$. By using direct variational analysis based on the
comparison of the ground state energy levels, we obtain a characterization of
the limit profile of the positive ground states for $\lambda\to \infty$.
