While we're on the subject of static assets, we should briefly mention image optimization. We'll cover this in much more detail in the next chapter, but it's worth highlighting some common problems here. As you have very little control over network conditions between your infrastructure and the user, low throughput may be a problem in addition to high latency.
Web applications heavily use images, especially on landing pages or home pages, where they might form a fullscreen background. It is regrettably common to see a raw photo from a camera simply dropped straight in. Images from cameras are typically many megabytes in size, far too big for a web page.
You can test whether there are problems on a web page using a tool, such as Google's PageSpeed Insights. Visit developers.goog le.com/speed/pagespeed/insights , enter a URL, and click on ANALYZE to view the results. Google use this information as part of their search engine ranking, so you would do well to take its advice...