The very first template is going to be more time-consuming as we will need to re-create all supporting components like the footer, header, the menu, and others that appear on the template.
Also, it depends on the complexity of your site elements that will need to be recreated. Usually, the first template falls in the range of 10k-15k EUR/USD, with the next being lower as we will already have the elements that will be reused (header, footer, menu, etc).
We see increasing the PageSpeed score as one of the key areas of improvement for any eCommerce website. Activities for increasing PageSpeed can be implemented along with CRO, UI/UX optimizations, AI services implementation by our Support & Maintenance dedicated team.