  We elaborate on recent results regarding the self-consistency of de Sitter
vacua in the LARGE-volume scenario of type IIB string theory. In particular, we
analyze to what extent the control over warping, curvature and $g_s$
corrections depends on the topology and the orientifold/brane data of a
compactification. We compute a general bound on the magnitude of these
corrections which strongly constrains the D3 tadpole. The minimally required
tadpole ranges from $\mathcal{O}(500)$ to $\mathcal{O}(10^6)$ or more and
depends strongly on other data, in particular on the Euler number of the
Calabi-Yau 3-fold, the triple-self-intersection and Euler numbers of the small
divisor and the coefficient $a_s$ appearing in the non-perturbative
superpotential. We give arguments suggesting that satisfying these constraints
is very challenging and perhaps impossible.
