I use three.js to render the voxels as a set of triangles. I have it to make 5 million triangles conveniently, but that seems to be the limit. You can view it online here .
Select the Dublin model in Resolution 3 to see many triangles.

I used every trick to get it so far (buffer geometry, voxel selection, multiple buffers), but I think that it has reached the maximum amount that openGL triangles can reach.
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, , . - three.js