Hello,
I have updated theme to the latest version that comes with speed improvements and activated the cache plugin. Check results:
before – https://gtmetrix.com/reports/lamoz.net/RXZJ4aiq/
after – https://gtmetrix.com/reports/lamoz.net/g4VHnjuQ/
Contact your hosting provider and ask to reduce the server response time and improve other moments related to server-side.
Regards