SVG 动画：Chrome 中的缓慢/性能不佳

Question

我们正在开发一个相当复杂的场景，其中包含许多移动部件，到目前为止还没有涉及任何 SVG 动画。

一切都很顺利并且表现良好，直到我们引入了一个带有几条虚线的 SVG，我们使用 stroke-dashoffset 属性对它们进行了动画处理。

它在 Edge 或 Firefox 中完全没有区别，但在 Chrome 中，整个场景的动画变得断断续续和缓慢。

我们甚至尝试了两种方法来达到相同的目的——CSS 关键帧和 SVG 元素内的 SMIL——但两者的表现同样糟糕。

是否有我们缺少的 Chrome 性能技巧？

编辑：示例

标记：

.stream {
  animation: stream 10s infinite;
}

@keyframes stream {
  100% {
    stroke-dashoffset: 100;
  }
}

<svg version="1.0" id="streams" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 225.32 66.19" enable-background="new 0 0 225.32 66.19" xml:space="preserve">
      <path class="stream" fill="none" stroke="#000" stroke-width="1.75" stroke-linecap="round" stroke-miterlimit="10" stroke-dasharray="3,4" d="M107.38,50.54c0,0-6.78-84.52-106.51-22.2" />
      <path class="stream" fill="none" stroke="#000" stroke-width="1.75" stroke-linecap="round" stroke-miterlimit="10" stroke-dasharray="3,4" d="M110.49,45.31c-0.63-13.01-4.56-44.87-27.83-43.8c-27.6,1.27-37.33,39.66-38.49,60.34"/>
      <path class="stream" fill="none" stroke="#000" stroke-width="1.75" stroke-linecap="round" stroke-miterlimit="10" stroke-dasharray="3,4" d="M180.63,59.88c-0.69-9.65-3.6-30.18-15.76-45.51C148.44-6.34,131.85,2.22,128.87,5c-2.89,2.7-12.81,7.14-14.28,42"/>
      <path class="stream" fill="none" stroke="#000" stroke-width="1.75" stroke-linecap="round" stroke-miterlimit="10" stroke-dasharray="3,4" d="M118.59,45.41c2.4-10.18,9.9-31.97,30.87-37.59c26.03-6.98,55.13,9.32,72.02,19.37"/>
</svg>

Answer 1

您需要将动画的缓动linear设置为。运行下面的代码片段，看看它的运行速度没有明显的减慢。

.stream {
  animation: stream 10s linear infinite;
}

@keyframes stream {
  100% {
    stroke-dashoffset: 100;
  }
}

<svg version="1.0" id="streams" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 225.32 66.19" enable-background="new 0 0 225.32 66.19" xml:space="preserve">
      <path class="stream" fill="none" stroke="#000" stroke-width="1.75" stroke-linecap="round" stroke-miterlimit="10" stroke-dasharray="3,4" d="M107.38,50.54c0,0-6.78-84.52-106.51-22.2" />
      <path class="stream" fill="none" stroke="#000" stroke-width="1.75" stroke-linecap="round" stroke-miterlimit="10" stroke-dasharray="3,4" d="M110.49,45.31c-0.63-13.01-4.56-44.87-27.83-43.8c-27.6,1.27-37.33,39.66-38.49,60.34"/>
      <path class="stream" fill="none" stroke="#000" stroke-width="1.75" stroke-linecap="round" stroke-miterlimit="10" stroke-dasharray="3,4" d="M180.63,59.88c-0.69-9.65-3.6-30.18-15.76-45.51C148.44-6.34,131.85,2.22,128.87,5c-2.89,2.7-12.81,7.14-14.28,42"/>
      <path class="stream" fill="none" stroke="#000" stroke-width="1.75" stroke-linecap="round" stroke-miterlimit="10" stroke-dasharray="3,4" d="M118.59,45.41c2.4-10.18,9.9-31.97,30.87-37.59c26.03-6.98,55.13,9.32,72.02,19.37"/>
</svg>