GALES is a generalpurpose multiphysics finite element software developed at INGV Pisa, and it consists of various solvers for computational fluid dynamics (CFD), computational solid dynamics (CSD) and fluidsolid interaction (FSI). The software has been verified and validated on several benchmarks. The software is intended to be used for highperformance computing (HPC) on cluster machines and has been in regular use to study 2D volcanology problems such as magma transport and rock deformation. Recently, the numerical code has been extended to 3D. In this report, we present the implementation of GALES for a parallel environment and perform a strong scaling study on various solvers of GALES for 3D problems.