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The MCAO Assisted Visible Imager and Spectrograph (MAVIS) is a new visibleinstrument for ESO Very Large Telescope (VLT). Its Adaptive Optics Module (AOM)must provide extreme adaptive optics correction level at low galactic latitudeand high sky coverage at the galactic pole on the FoV of 30arcsec of its 4k x4k optical imager and on its monolithic Integral Field Unit, thanks to 3deformable mirrors (DM), 8 Laser Guide Stars (LGS), up to 3 Natural Guide Stars(NGS) and 11 Wave Front Sensors (WFS). A careful performance estimation isrequired to drive the design of this module and to assess the fulfillment ofthe system and subsystems requirements. Here we present the work done on thistopic during the last year: we updated the system parameters to account for thephase B design and for more realistic conditions, and we produced a set ofresults from analytical and end-to-end simulations that should give a ascomplete as possible view on the performance of the system.

MAVIS: performance estimation of the adaptive optics module