proxy for 3d scenes in VSE

ability to render proxy video for 3d scenes in blender when using a video sequencer. it amazing that we can put our 3d scene in VSE but its really slow even with eevee. When using workbench it works fine but using eevee makes the whole sequence really slow to render.

It is possible to render the scene in video then take it to blender sequencer but thats break the whole purpose of having 3D scenes

wish blender had a option to render the 3d scene without me having to render it and put it back in VSE as a video sequence.