Purging Unused GPU Resources
Accessible in: Matter : Edit > Purge Unused GPU Resources |
When products are opened in Matter, each of them consumes GPU resources even if the product is not currently being modified. Materials, textures, backgrounds, environments, overlays, and post-processes are stored in the memory. Closing a product’s viewport will free up the GPU resources assigned to this product.
Another means of freeing GPU resources while keeping multiple products open in viewports is to use the Purge Unused GPU Resources option by simply clicking the corresponding button 
located in the Edit menu in Matter .