[k__]

True story.

There is no endless RAM, even for browsers :)

DOM-nodes are rather heavy compared to simple JS objects, so getting rid of them can bring some visualizations that are too heavy for the browser back into the realm of doable.

After that you have to optimize your other data-structures. If you have objects with many boolean fields or strings that are essentially used as enums, you can try to replace them with bit-fields, I read some library creators (BlueBird promise) got much performance gains with them.