'mod_pagespeed' is a module of Apache which is nothing but plugin which is used for compressing the external code of JavaScript and CSS. It also used to increase the page load time as it combines multiple external JavaScript files in one file so it reduces the HTTP request.
Steps to install the mod_pagespeed on EasyApache 4-
1. SSH to the server with root access and fire below commands
yum install rpm-build cpio ea-apache24-mod_version
wget https://github.com/Prajithp/cpanel/raw/master/EA4/ea-apache24-mod_pagespeed-1.9-32.11.src.rpm
rpmbuild --rebuild ea-apache24-mod_pagespeed-1.9-32.11.src.rpm
rpm -ivh /root/rpmbuild/RPMS/x86_64/ea-apache24-mod_pagespeed-1.9-32.11.x86_64.rpm
2. After that restart Apache service using below command
/etc/init.d/httpd restart
3. Now you will need to clone the script in your cPanel server by below command -
/usr/local/cpanel/3rdparty/bin/git clone https://github.com/pagespeed/cpanel.git /tmp/pagespeed/
4. Now create Speed.pm.tar.gz -
cd /tmp/pagespeed/Easy
tar -zcvf Speed.pm.tar.gz pagespeed
mkdir -p /var/cpanel/easy/apache/custom_opt_mods/Cpanel/Easy
mv Speed.pm Speed.pm.tar.gz -t /var/cpanel/easy/apache/custom_opt_mods/Cpanel/Easy/
cd && rm -rf /tmp/pagespeed
5. For verifying it you can log in to WHM >> EasyApache >> Search for the mod_pagespeed option.