I just checked your site with google’s site speed tool here:
As you can see, some elements of your site are taking longer than 5.4 seconds to load.
We have a small team here and have been fixing this exact issue for coming up 10 years now.
Let me know if you are interested and we can arrange one of our team to run an audit for you?
You can email me direct at: firstname.lastname@example.org or message the team directly at: