Comet cache not working after installation/activation

Hi,
I read all the options of the plugin after installation, I activate the plugin correctly, I unlogged from my site, empty cache and cookies and then start to test:
– The site speed is the same as before (gtmetrix.com);
– There is no code in the source of different pages I test that show that the plugin is active and work.
Everything is fine on the site and on the admin, except the plugin don’t work.
I am out of options to test and I would be happy to use it if it could work…
Thanks for your help.

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