There are several reasons why your frames-per-second rate might be too small, causing single frames to be strongly noticeable.
Enscape is rendered GPU only, so you might consider to invest in a faster GPU, e.g. an NVIDIA GTX 980 for a free-flowing experience.
Usually it’s not the project size that is the issue but rather the project containing a lot of fine tessellated geometry such as pipes, cables, and furniture, or lots of high-res textures. All this might be overwhelming your computer. Try to hide elements in your project, especially small but detailed things.
You can increase your rendering speed simply by dragging the corner of the Enscape window to make it smaller. This reduces the amount of rendered pixels, increasing rendering speed.
In general, if you’re experiencing performance issues, try setting the Rendering Quality slider in the ‘General’ settings tab to a lower value. This can often times boost performance through turning off some of the more expensive rendering features.
For some projects, Enscape’s loading time can take up to a few minutes.
Loading time is determined by how long it takes for Revit or SketchUp to communicate the content of your project. Therefore, the more complex your project is in Revit or SketchUp, the longer it may take for Enscape to load. To shorten loading times, try the following: