It is not an SVG! It is a band-width problem, in this case. I needed about 10 minutes real-time to download this image at full-size to my computer, but can work anyway in parallel. Vector-grafics should have been FAR MORE compressibale then jpeg or other snapshots from random/real-word scenery! Thus, an irreal example.
I know, but the point stands. Who would want it embedded full size in their browser? The problem with that image is not (only) the bandwidth needed to download, that could be overcomed by waiting longer. The browser can freeze simply from trying to load it all into memory. Not so long ago desktop computers wouldn't even fully hold it into memory (and it's probably still the case on some less computer-developed countries).
Plus, vector graphics compress *much better* than raster, but they are *much slower* presenting them. Try filling a web page of svg flags, and see how much it takes to load. Or compare times showing times for raster and vectorial.