  Requiring that the contributions of supersymmetric particles to the Higgs
mass are not highly tuned places upper limits on the masses of superpartners --
in particular the higgsino, stop, and gluino. We revisit the details of the
tuning calculation and introduce a number of improvements, including RGE
resummation, two-loop effects, a proper treatment of UV vs. IR masses, and
threshold corrections. This improved calculation more accurately connects the
tuning measure with the physical masses of the superpartners at LHC-accessible
energies. After these refinements, the tuning bound on the stop is now also
sensitive to the masses of the 1st and 2nd generation squarks, which limits how
far these can be decoupled in Effective SUSY scenarios. We find that, for a
fixed level of tuning, our bounds can allow for heavier gluinos and stops than
previously considered. Despite this, the natural region of supersymmetry is
under pressure from the LHC constraints, with high messenger scales
particularly disfavored.
