Are there any data compression modules available?
Yes, mod_deflate is available. You will need to modify you .htaccess file to enabled this:
<IfModule mod_deflate.c>SetOutputFilter DEFLATEBrowserMatch ^Mozilla/4 gzip-only-text/htmlBrowserMatch ^Mozilla/4.0[678] no-gzipBrowserMatch bMSIE !no-gzip !gzip-only-text/htmlSetEnvIfNoCase Request_URI .(?:gif|jpe?g|png)$ no-gzip dont-varyHeader append Vary User-Agent env=!dont-vary</IfModule>