powerful and simple algorithm which eliminates the lag when editing heavy and dense geometry models

When we have to elaborate a dense geometry of polygons, to avoid the annoying lag, we use to select the geometry that we do not have to process and we hide it, so the model immediately becomes light to edit.

So why not use an algorithm that does this automatically?

Here is my proposal: An algorithm that selects and hides the unaffected geometry and maintains a temporary feedback of the geometry with the buffer of a fake geometry, a rasterized image of the geometry that will remain "fake" so as long as we are modifying the geometry that interests us.

The algorithm must also contain a function that monitors the presence of lag from too heavy geometry and will activate this function if there is a lag of performance

(edit) for a better explanation

when this algorithm hides the true geometry that is not affected by editing and temporarily replaces it with a fake geometry that is a rasterized image, The part of the model that is edited is easily lightened because much of the true geometry is actually hidden, in fact, many less polygons are processed when editing the model.
this process takes place automatically and without the user noticing, the final result would be a heavy geometry object that apparently seems light to edit.

I think this small feature could revolutionize performance a lot