Hi @fiona92
I had a look at your page. The problem seems to be the fact that there are 4 galleries loading on your page all at once. The browser can only download a certain number of things at a time, so loading all the thumbs on the inactive tabs is what is causing the delay. My initial recommendations are:
1) Get the tabs to work in an ajax fashion, so only once you click on the tab, will it load the content for that tab. (This is prob not possible without some development)
2) Rather use the PRO feature of filtering, so create a single large gallery with all the items. Tag each item accordingly to Villas, Suites, Wildlife or Resort. By doing this, the lazy loading will work correctly and only load the items that are visible on the page which will improve performance.
@steveush – any other recommendations to improve load time?