ViZiR 4 is an interactive visualization software that uses OpenGL 4 graphic pipeline. It can be used to analyze large meshes with possibly solutions and in this paper the focus is made with results from the 4th AIAA CFD High Lift Prediction Workshop. To perform such simulations, it is necessary to have fast, precise and interactive tools to analyze, check and validate the numerical results obtained. Fast I/O and rendering is important to inspect results and comparisons with ParaView show that ParaView is much slower (ratio between 5 and 50). Many post-processing tools, such as picking, hiding surfaces by reference, isolines rendering and clip planes generation, allow to quickly investigate meshes and solutions. Pixel exact rendering permits to have a precise preview of solutions and tessellations on GPU are used to render high-order and curved elements. Some scripting tools allow to generate quickly images and go over sequences of several meshes that is useful when mesh adaptation is involved. All along the paper, results from the workshop are shown to illustrate the capabilities of ViZiR 4.