Given that the website is about a company whose work is based on physical presence, namely "interior renovation" and "bespoke carpentry", concentrate your efforts on knowing whether the site is fast enough for potential customers in the area.
In other words, it doesn't really matter much to me on the US west coast that your site takes 1-2 seconds to load a page because I'm not going to be requesting your services.
I do see a number of assets loaded - Javascript and CSS and such - and each one takes a noticeable fraction of a second to load, however they load in parallel so that doesn't add much time to the overall page load. And they do appear to be properly cached so they'll only need to get loaded one time.
That said, you could look into a CDN. Especially for common things like jQuery, where all you have to do is point to one of the free CDNs instead of having it load from your own servers.
Beyond that, the first question to answer for yourself is how much money you want to spend on improving performance; for example, doing things like hosting your site in multiple geographic zones will speed up international and overseas traffic, but it isn't necessarily cheap to do.