Smaller version can be found at http://www.clicktorelease.com/tmp/google-svg/image.svg which I found at https://www.quora.com/How-could-Googles-new-logo-be-only-305-bytes-while-its-old-logo-is-14-000-bytes#ld_bnfytn_155043
An even smaller version (458b) can be found at https://www.notehub.org/2015/9/8/google-logo-2015 however contains more than just the image.
Talk pages are where people discuss how to make content on Wikipedia the best that it can be. You can use this page to start a discussion with others about how to improve the "File:Google 2015 logo.svg" page.
