I did a smoke browsertime runs to see the differences between FCP and timeToContentfulPaint. [Link](https://docs.google.com/spreadsheets/d/1Xobjn35hXuupnNo9yaXEILAaCwDB1mhEGedJMUPK3Cc/edit?usp=sharing) Most of the sites report a 2-5% differences, some of the highest is like 9% difference. Although the samples are small, I'd still assume that a 3% - 5% improvement to FCP are going to appear in our test result once we land the FCP patches. The 9% ones look odd though, maybe it indicates a performance issue that we can improve, the performance between displayList building to the actual paints.
Bug 1518999 Comment 34 Edit History
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I did a smoke browsertime runs to see the differences between FCP and timeToContentfulPaint. [Link](https://docs.google.com/spreadsheets/d/1Xobjn35hXuupnNo9yaXEILAaCwDB1mhEGedJMUPK3Cc/edit?usp=sharing) Most of the sites report a 2-5% difference, some of the highest are like a 9% difference. Although the samples are small, I'd still assume that a 3% - 5% improvement to FCP is going to appear in our test result once we land the FCP patches. The 9% ones look odd though, maybe it indicates a performance issue that we can improve, the performance between displayList building to the actual paints.