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CONCRETE PLAYGROUND Test Results Mobile Usability: 100/100 Mobile Speed: 89/100

Quick overview:
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.
90.5KiB of the HTML response was required to render the above-the-fold content. This requires 3 network round-trips. Prioritize the above-the-fold content so that it can be rendered with only the first 2 round-trips' worth of HTML.
None of the final above-the-fold content could be rendered with the HTML delivered within 2 round-trips.
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.
Leverage browser caching for the following cacheable resources: (expiration not specified)
Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 2.1KiB (44% reduction).
Compressing could save 2.1KiB (44% reduction).
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.
Minify HTML for the following resources to reduce their size by 1.8KiB (35% reduction).
Minifying could save 1.2KiB (35% reduction) after compression.

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