随时间变化的速度评分
随时间变化的速度评分部分会显示您的速度评分在所选日期范围内的变化情况。该部分包含一个图表和一个表格，图表用于跟踪您在一段时间内的评分，而表格则列出历史评分和应用安装或卸载事件。
图表包含事件标记，这些标记表示正在安装或卸载的应用。这些事件可能会影响您的速度评分，也可能不会对其产生影响。您可以通过点击活动标记来查看已安装或已卸载应用的列表。
利用此部分，您可以识别与应用相关的事件（这些事件会对您的评分产生正面或负面影响），并对其进行调查。例如，如果您在安装应用后评分下降，则应考虑评估应用，以确定应用引入的功能是否超过了对商店速度的影响。
加载在线商店速度报告时，图表会显示过去 7 天的评分。您可以使用日期范围选择器更改日期范围。评分将在上午 9:00 UTC 重新计算。如果您错过了报告中的最新评分，则应在当天晚些时候再次查看。
您可能不会每天都有速度评分。缺少的速度评分在速度评分图表中以空白的形式显示，表格中的评分也留空 (—)。了解阻止速度报告运行的因素。
Shopify 测试环境
您的在线商店速度报告中的评分可能与使用 PageSpeed Insights 或 Chrome DevTools 计算的评分不同。这是因为运行 Lighthouse 报告的环境会影响报告结果，并且所有平台上的评分仅代表测量时商店的速度。
在 Shopify 测试环境中运行的 Lighthouse 报告不会因 Internet 连接速度、设备处理能力、浏览器扩展或防病毒软件等因素而产生波动。这是因为所有用于速度评分的 Lighthouse 性能报告都使用相同的 Shopify 环境运行，因此我们可以准确地将您的评分与 Shopify 平台上其他在线商店的评分进行比较。
其他因素可能会导致您的评分每天都发生变化。
Shopify商户官网原文详情：
Speed score over time
The Speed score over time section shows you how your speed score has changed over the selected date range. The section includes a chart that tracks your score over time and a table that lists your historical scores and app install or uninstall events.
The chart includes event markers, which represent an app being installed or uninstalled. These events might or might not impact your speed score. You can view a list of the apps that were installed or uninstalled by clicking on the event marker.
Using this section, you can identify app-related events that positively or negatively impacted your score and investigate them. For example, if your score declines after you install an app, then you should consider evaluating the app to decide whether the features the app introduces outweigh the impact to the speed of your store.
When the Online store speed report loads, the chart shows the last 7 days of scores. You can alter the date range using the Date range picker. Scores are recalculated at 9:00 am UTC. If you are missing the most recent score in your report, then you should check again later in the day.
You might not have a speed score for every day. Missing speed scores appear as gaps in the speed score chart and as an empty score (
—) in the table. Learn about the factors that prevent the speed report from running.The Shopify test environment
Scores in your online store speed report might be different than scores you calculate using PageSpeed Insights, or Chrome DevTools. This is because the environment where the Lighthouse report is run impacts the report results, and because scores on all platforms only represent a point-in-time measurement of your store's speed.
Lighthouse reports run on the Shopify test environment do not fluctuate based on common factors like internet connection speed, device processing power, browser extensions, or antivirus software. Because all Lighthouse performance reports used for speed scores are run using the same Shopify environment, we can accurately compare your score to that of other online stores on the Shopify platform.
Other factors might cause your score to change from day to day.
文章内容来源：Shopify商户官方网站
