mod_deflate is use to compress the data before sending it to client end. It is an apache module which is useful in order to save the bandwidth as it compresses the data.
Login to CWP >>> Apache Settings >>> Apache Configuration.
Login to your Server using any SSH client like Putty and open following file.
And search for following line.
# LoadModule deflate_module modules/mod_deflate.so
service httpd restart
That’s it, mod_deflate module is enabled now in your CWP server.