Hi Donald,
thanks for your answer.
My site is https://www.crisconsult.com I use pingdom.com to analyse the load time. When I deactivated the Cleeng plug-in the load time was 2s in average; i’ve just activated Cleeng again and load time is now frequently above 4s.
The file that takes more time to load is: client.en_US.js?ver=3.4.1
You can see this result if you test the site in: https://tools.pingdom.com
Let me know if you need any extra information and thanks a lot for your help.