<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have searched the <a href="https://github.com/apache/dubbo/issues">issues</a> of this repository and believe that this is not a duplicate.</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have checked the <a href="https://github.com/apache/dubbo/blob/master/FAQ.md">FAQ</a> of this repository and believe that this is not a duplicate.</li>
</ul>
<h3 dir="auto">Environment</h3>
<ul dir="auto">
<li>Dubbo version: master</li>
<li>Operating System version: windows</li>
<li>Java version: 1.8</li>
</ul>
<p dir="auto">In ExtensionLoader, EXTENSION INSTANCES is a ConcurrentHashMap with a default size, and the extension class provided in Dubbo has exceeded 16.<br>
Start the program, it will expand at least twice. I think it is more appropriate to add an initial size of 64 here.<br>
Other places where ConcurrentHashMap is used should also pay attention to a suitable initial size</p>
<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> I have searched the <a href="https://github.com/apache/dubbo/issues">issues</a> of this repository and believe that this is not a duplicate.</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> I have checked the <a href="https://github.com/apache/dubbo/blob/master/FAQ.md">FAQ</a> of this repository and believe that this is not a duplicate.</li>
</ul>
<h3 dir="auto">Issue Detail</h3>
<p dir="auto">I have read <a href="http://dubbo.apache.org/en-us/docs/dev/implementation.html" rel="nofollow">dubbo website</a>.<br>
And when I have reached  to <code class="notranslate">RPC details</code> section, I found that the picture has notes in Chinese. It is not international friendly since this page is not just for Chinese developers.</p>
<h4 dir="auto">see the picture below</h4>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://user-images.githubusercontent.com/6781070/64228239-c8690000-cf18-11e9-83f3-b49ef834b81f.png"><img src="https://user-images.githubusercontent.com/6781070/64228239-c8690000-cf18-11e9-83f3-b49ef834b81f.png" alt="image" style="max-width: 100%;"></a></p>
<p dir="auto">BTW, If I am willing to contribute to the website, is there any way ?</p>