Even though page speed depends upon many factors, followings tweaks may help to increase the site speed for some reasonable points.
Try to use the image dimensions as per size info given near image uploading field.
Optimize your images using tools like https://tinypng.com/ and then upload into Shopify store.
While you use most compact grids like 4/5 items per row. You can change the image class from large to medium/required size in the followings snippets.
product-grid-item.liquid
home-product-grid-item.liquid
search-result.liquid
Our theme comes with multiple header, footers and detail page layout, while you finalize the layout, you can takeout unused sections, snippets and related scripts by using our support team assistance.
For further assistance, kindly send your store details to the support mail support@wedesignthemes.com.