I use mediaTemple on an Apache server. I contacted them as the gzip was not working. tye said it is not enabled by default but sent me to this technote. https://mediatemple.net/community/products/grid/204643600/is-mod_gzip-installed
Should the sample they give replace all of the Hummingbird code in the .htaccess file?
AddOutputFilterByType DEFLATE text/html text/plain text/xml