I'm re-designing my site, making extensive use of SVG graphics. When I loaded the new images onto my server and began testing, I noticed that all but three of the SVGs "flickered" or blinked between each page load. The effect only occurs in Google Chrome - other browsers are unaffected. Because they are in the header, this is a very annoying effect and must be fixed. I investigated by looking at the headers; sure enough, different headers are sent for the images which do not flicker and those which do. Here are the headers for an SVG Facebook icon, which does not flicker: Code: accept-ranges:bytes cache-control:max-age=2592000 cache-control:public, must-revalidate, proxy-revalidate content-length:674 content-type:image/svg+xml date:Sat, 02 Apr 2016 19:39:37 GMT etag:"56fef1c8-2a2" expires:Mon, 02 May 2016 19:39:37 GMT last-modified:Fri, 01 Apr 2016 22:10:16 GMT server:nginx status:200 Here are the headers for an Instagram SVG icon, which does flicker: Code: cache-control:max-age=2592000, public, must-revalidate, proxy-revalidate content-encoding:gzip content-type:image/svg+xml date:Sat, 02 Apr 2016 19:39:37 GMT etag:W/"56ff1731-13bd" expires:Mon, 02 May 2016 19:39:37 GMT last-modified:Sat, 02 Apr 2016 00:49:53 GMT server:nginx status:200 vary:Accept-Encoding Here are the major points of difference that I found: The non-flickering images are less than 1KB in size. To verify this, I added comments into the SVG markup for the Facebook icon to boost its size over 1KB; its headers then matched the other images and it began to flicker between page loads. The non-flickering images are not gzipped. The non-flickering images have multiple "cache-control" headers. The flickering images do not have a "content-length" header. The flickering images do not have "vary" or "accept-ranges" headers. There are no changes to my Nginx configuration that I'm aware of which would be affecting this. I'm using the default staticfiles.conf setup included in Centminmod. Any ideas as to what might be causing this difference, and how I might be able solve this problem?