My viewer seems to be running slow

As with any web-based 3D graphics application, the performance that you get will be dependent on a number of factors, including:

• Your laptop/PC processing power
• Your graphics processor (GPU)
• Other applications/downloads that are running on your computer at the time

It is not possible to give a minimum specification, but to get good performance, you should ideally have a laptop with a dedicated GPU (e.g. nVidia or AMD), have a reasonably modern CPU with multiple cores, and not have other compute-intensive software running.

For laptops with multiple GPUs, see This article for instructions to ensure that the high performance GPU is being used.