if I using what is everywhere recommended - using CDN attachment for "Font Awesome" everytime flickering "on page load".
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css" rel="stylesheet" />
Q how prevent flickering?
In my solution I download font resources to server
But even than still happened - Chrome and Firefox too.
For that is there font type "woff2". I add new webserver handler:
for #iis add
C:\Program Files\IIS Express\AppServer\applicationhost.config
<mimeMap fileExtension=".woff2" mimeType="font/woff2" />
and for #nginx add (see how Mime type for WOFF fonts?)
/etc/nginx/mime.types || or /usr/local/nginx/conf/mime.types
font/woff2 woff2;
Mime types by Mozilla.
Now font icons are loaded fast like images.
I hope this helps someone.