The SVG could also be served with gzip compression.
>>> len('<svg xmlns="http://www.w3.org/2000/svg" width="256" height="256" viewBox="0 0 256 256"><path d="M0 0h256v256H0z" fill="#aad3df"/></svg>'.encode('zip'))
122
$ echo '<svg xmlns="http://www.w3.org/2000/svg" height="256" width="256" viewBox="0 0 1 1"><circle r="2" fill="#aad3df"/></svg>' | brotli -9 - | wc -c
93 $ echo '<svg xmlns="http://www.w3.org/2000/svg" height="256" width="256"><circle r="1000" fill="#aad3df"/></svg>' | brotli -9 - | wc -c
83