  The MCAO Assisted Visible Imager and Spectrograph (MAVIS) is a new visible
instrument for ESO Very Large Telescope (VLT). Its Adaptive Optics Module (AOM)
must provide extreme adaptive optics correction level at low galactic latitude
and high sky coverage at the galactic pole on the FoV of 30arcsec of its 4k x
4k optical imager and on its monolithic Integral Field Unit, thanks to 3
deformable mirrors (DM), 8 Laser Guide Stars (LGS), up to 3 Natural Guide Stars
(NGS) and 11 Wave Front Sensors (WFS). A careful performance estimation is
required to drive the design of this module and to assess the fulfillment of
the system and subsystems requirements. Here we present the work done on this
topic during the last year: we updated the system parameters to account for the
phase B design and for more realistic conditions, and we produced a set of
results from analytical and end-to-end simulations that should give a as
complete as possible view on the performance of the system.
