  The Compact Linear Collider is one of the two main European options for a
collider in a post Large Hadron Collider era. This is a linear $e^+e^-$
collider with three centre-of-mass energy stages: 380 GeV, 1.5 TeV and 3 TeV.
The luminosity performance of the first stage at 380 GeV is presented including
the impact of static and dynamic imperfections. These calculations are
performed with fully realistic tracking simulations from the exit of the
damping rings to the interaction point and including beam-beam effects in the
collisions. A luminosity of $4.3\times10^{34}\,\text{cm}^{-2}\text{s}^{-1}$ can
be achieved with a perfect collider, which is almost three times the nominal
luminosity target of $1.5\times10^{34}\,\text{cm}^{-2}\text{s}^{-1}$. In
simulations with static imperfections, a luminosity of
$2.35\times10^{34}\,\text{cm}^{-2}\text{s}^{-1}$ or greater is achieved by 90%
of randomly misaligned colliders. Expressed as a percentage of the nominal
luminosity target, this is a surplus of approximately 57%. Including the impact
of ground motion, a luminosity surplus of 53% or greater can be expected for
90% of colliders. The average expected luminosity is
$2.8\times10^{34}~\text{cm}^{-2}\text{s}^{-1}$, which is almost twice the
nominal luminosity target.
