Hello there,
Are you running the Moodle website in a dedicated/cloud server? You may be requiring a server optimization to boost the website speed. Moodle comes already tuned in terms of code so there is a big chance that is the server be running with just basic settings, without caching any content or doing any compression.
I can take a look if you want. Kindly check my freelancer customer reviews to find out more about my Linux skills.
Regards,
Nick.