It seems that your script processing time is the problem.
Have you tried to enable caching in your cms?
I also mentioned that you are not using browser caching for your images, js and css files.
To enable this you can try to add this to your .htaccess:
# cache images/pdf docs for 10 days
<FilesMatch "\.(ico|jpg|jpeg|png|gif|js|css)$">
Header set Cache-Control "max-age=864000, public, must-revalidate"
Header unset Last-Modified
</FilesMatch>
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