Compression default enabled on the web server
Performance compression is enabled by default on the web server. See the HTTP connector in server.xml located in \Server\tomcat-*\conf.
<Connector URIEncoding="UTF-8" compression="on" connectionTimeout="20000" maxHttpHeaderSize="16384" port="18170" protocol="HTTP/1.1" redirectPort="8443" server="webserver"/>
When you are close to the web server and CPU cycles are important, the compression slows down the application. You can disable it if required.