Do you have mod_gzip installed on your shared server?
All TMDHosting servers come with enabled mod_gzip. More information about the enabled modules on the server could be found by running a phpinfo() function. To run the phpinfo(), simply create an empty php file in your public_html folder. Call the file i.php and open it with a text editor. Add the following lines:
<? echo phpinfo(); ?>
and save the file.
Then access the file using your domain: