Web Core Vitals - scores wildly fluctuate?
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I have run lighthouse reports multiple times today, and they have bounced up and down 20 points within hours of each other. A coworker ran hist test that returned a 90 while I scored a 68, my next test was an 88? Is this a common issue. I can understand a few points, but this is insanity!
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@gpainter thanks! I will check that out. My lighthouse plugin on both chrome and firefox has stopped working.
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@dezzign Thank you! That is great stuff.
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as well as what @Dezzign said which are excellent points you can use Googles speed test tool which inf act runs lighthouse under it, you can also use GTmetrix which can also be a great way to see how you're doing, its always good to get a couple of input points.
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A couple of quick tips that may help:
- Make sure you have the site scrolled to the very top of the screen, otherwise the scores will be different, because the test leverages the visual layout you see on the screen.
So if you're scrolled down the page a bit, and then you do a test, you'll get a different result because of different layout shifts caused by the different non-critical elements taking longer to load. Also, make sure you dock the Dev tools in a different window, so the page being tested has the full normal screen size without Dev tools .at the bottom etc.
- Your co-worker might be viewing the site on a different screen size, so there may be less CLS (cumulative layout shift) happening on their screen size, which is why the scores would be different.
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