Thank you Kuba for sharing your work!
As you noticed in the Shapespark releases thread, the shared geometry support introduced in the version 1.8 reduces memory usage for office spaces with many identical objects.
For example, before the update the geometry buffers in your blockvue_2000mansfield scene used 105MB of GPU memory, and now they use only 28MB.
Scenes hosted on Shapespark hosting were automatically switched to this new version, so you don’t need to upload them again.