I have created my website about Culper precision. recently , I have changed the theme of website. due to these changings my website take time in loading that is sometime more irritating for me.
Have you checked the Cache status in Magento admin, may be its disabled, you can enable it from Magento Admin by going to System -> Cache Management -> Check the enable status.
you can also change it from cli by command
php bin/magento cache:enable