I've been SEO using Event Booking for a year now and I see that the speed could be optimized a lot with small improvements.
One of these improvements is to make events thumbnails image (for example in list view or timeline view) to load from the same url. For now it is the exact same image but each one is loaded from different url, which make the user full load time very long in list view.
The second one is to put the width and height of the image into
image html parameters
. The robot really like that and I suppose it is easy to make ^^