lightweight SVG viewer
You have quite the diverse range of options:

Free:

Gapplin (AppStore) 14MB

macSVG 9MB


  macSVG is a MIT-licensed open-source macOS application for designing and editing Scalable Vector Graphics (SVG) content for HTML5 web pages, mobile apps, animation design, and general graphics usage.


SVGViewer


  Fast, Free and Simple SVGViewer file Viewer
  Open and export SVG files on Mac, send to friends. Download SVGViewer for Mac. It’s free!


And with an additional footprint of 0 bytes:


your favourite browser!