Google Analytics Summary 
Auteur : Nigel W.Hello there...
I use Google Ads on my site, http://www.hampsteadheath.net
I have pasted its test results below to ask for comment from your programming team. (I think that it refers to the Home Page only)
(I understand the first point quite well as it is one which we have discussed on this board but I am thinking that the other Google results may refer more to the software programming than to anything I have real control over.
How say you?
PageSpeed Insights
Make your web pages fast on all devices.
This report has filtered out common third party resources. If you would like to include these resources, which may not be under your control, you may view the full report.Mobile51 / 100Desktop57 / 100Suggestions Summary
Optimize images
Properly formatting and compressing images can save many bytes of data.
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 2 blocking script resources and 5 blocking CSS resources. This causes a delay in rendering your page.
Prioritize visible content
Your page requires additional network round trips to render the above-the-fold content. For best performance, reduce the amount of HTML needed to render above-the-fold content.
Leverage browser caching
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Minify HTML
Compacting HTML code, including any inline JavaScript and CSS contained in it, can save many bytes of data and speed up download and parse times.
Hello Nigel,
The suggestions made by google can be taken in consideration to help the pages to load faster like Eliminate render-blocking JavaScript and CSS in above-the-fold content.
"Prioritize visible content" suggest to add inline css which would then give error when validating the website according to the W3C standard.
"Leverage browser caching" can vbe easily be achieved by adding a metatag in the HEAD section, but it is not necessary because all browsers, if the site has been previously visited, they will try to load the cached content first.
The Javascript code, which has a bigger size, is already minified.
I tested your homepage, and I noticed that the delay to load it comes more from the galleries present which brings the homepage, including all files, to 8,9mb which needs to be loaded.
If you want to speedup the site, it is more necessary to reduce the images because they make the big difference when loading.
Please feel free to write back if you need more information.
Auteur
Many thanks for your VERY useful reply, Claudio.
I will have a big "THINK" about this.
Nigel