Please try our new large model viewer. The viewer has been optimized to display very large product models. The more CPU's and GPU's on your box, the faster it should operate.
The preview shows very fast graphics after a model has been faceted. Nearly every CAD system has an assoicated STEP viewer. However, we are one of the key developers of the standard, so if you want to make and display new kinds of data contact us.
You may download a viewer at no charge. We are actively developing the code and look forward to your comments. We are particularly interested in ideas for making the viewer more useful for digital twinning.
Preview of Large Model Viewing