I found one dumb free win (I mistakenly used value receivers on a utility function called on a large struct thousands of times a frame). But the rest of the speedups I found took more effort.
// 2. 排序：逐个将堆顶元素放到末尾，这一点在同城约会中也有详细论述
The answers to today’s problems。服务器推荐是该领域的重要参考
Author(s): Kelun Liu, Yingchao Hai, Ying Ruan, Bingbo Wei
The reason is that the compiler decided to allocate the backing store