render optimizations

src/mol-canvas3d/canvas3d.ts

src/mol-canvas3d/helper/bounding-sphere-helper.ts

src/mol-geo/geometry/direct-volume/direct-volume.ts

src/mol-geo/geometry/geometry.ts

src/mol-geo/geometry/points/points.ts

src/mol-gl/_spec/renderer.spec.ts

src/mol-gl/renderable.ts

src/mol-gl/renderable/direct-volume.ts

src/mol-gl/renderable/points.ts

src/mol-gl/renderer.ts

src/mol-gl/scene.ts

src/mol-math/geometry/gaussian-density/gpu.ts

src/mol-repr/shape/representation.ts

src/mol-repr/structure/complex-visual.ts

src/mol-repr/structure/units-visual.ts

src/mol-repr/structure/visual/util/common.ts

src/mol-repr/volume/direct-volume.ts

src/mol-repr/volume/isosurface-mesh.ts

src/mol-repr/volume/representation.ts