For general information about the two methods see The Time Explicit Solver Algorithms in the COMSOL Multiphysics Reference Guide.
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1
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Always use the Avoid too small elements option in the Element Quality Optimization settings on the Free Tetrahedral nodes in the mesh (in 3D only). The Optimization Level can be set to different degrees Basic, Medium, or High. Using this option can greatly improve the mesh for dG applications and thus speed up the computation significantly.
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2
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Avoid small edges and surfaces in the geometry as these control the mesh. Several tools exist to remedy this by using the Virtual Operations in the geometry.
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For general information about optimizing quality see Element Quality Optimization in the COMSOL Multiphysics Reference Guide.
For information about virtual operations see Virtual Geometry and Mesh Control Operations in the COMSOL Multiphysics Reference Guide.
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