_hash_map</em>, and this is confirmed by the chart below:</p>
<p><img src="https://github.com/greg7mdp/parallel-hashmap/blob/master/img/stl_flat_par_speed.PNG?raw=true" alt="stl_flat_par comparison" /></p>
<p>Indeed, because of the scale is somewhat compressed due to the longer times of the std::unordered_map, we can barely distinguish between the blue curve of the <em>flat_hash_map</em> and the red curve of the <em>parallel_hash_map</em>. So let's look at a graph without the std::unordered_map:</p>
<p><img