为了比较Google Chrome浏览器和Safari浏览器的启动速度，我们可以使用一些工具来测试它们的启动时间。以下是两种浏览器启动速度的实测方法：
1. 使用`startup-time`命令行工具：
首先，确保已经安装了Node.js和npm。然后，在终端中输入以下命令来安装`startup-time`工具：

npm install -g startup-time

接下来，使用以下命令来测量Google Chrome浏览器的启动时间：

startup-time google-chrome --no-sandbox --no-remote --no-console --no-colors --no-progressbar --no-downloads --no-open-windows --no-tabs --no-popups --no-extensions --no-plugins --no-preferences --no-user-data --no-user-scripts --no-history --no-cache --no-storage --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads --no-downloads--noop

运行上述命令后，会显示一个包含启动时间的文本文件。
2. 使用`w3ccssom`工具：
首先，确保已经安装了`w3ccssom`工具。然后，使用以下命令来测量Google Chrome浏览器的启动时间：

w3ccssom google-chrome

同样，运行上述命令后，会显示一个包含启动时间的文本文件。
通过比较这两个工具的输出结果，可以得出Google Chrome浏览器和Safari浏览器的启动速度差异。