The GPU visualizer
The GPU visualizer is the place where you can see a visualization of each unit performance within the GPU. As you might know, the GPU has many different units working in parallel in order to do all the requested calculations. But sometimes some of these units hit their bounds, and can't process any more or any faster, and here comes the lag and performance issues based on the rendering pipeline. It is common, by the way, and it doesn't mean your content is that bad, but you can be bound by different units for different parts of the frame every day with the most complex and at the same time with the simplest projects!
But using the GPU visualizer will allow you to look at the parts where there is a bottleneck, and then you would know exactly what needs fixing. Because the visualizer is not embedded inside the editor UI by default, we have to launch it through the console (the same way you did before for the show flags), but this time you need to display the editor...