What is PLS by device CPU cores
PLS by device CPU cores breaks down your Perceived Load Speed (PLS) based on the number of CPU cores available on a user’s device.
CPU cores help browsers process JavaScript, render page layouts, decode images, and execute interactions. The more cores a device has, the more it can multitask and handle heavier workloads without delaying the rendering of key visual elements — directly impacting how fast the page feels to load.
Healthy PLS by device CPU cores sample
Should you worry
A healthy PLS by CPU cores lens shows faster perceived load speeds for users with more cores (e.g., 6 or 8), while still keeping things reasonably quick for mid-range setups (e.g., 4 cores).
If you notice slow PLS for users with fewer CPU cores (e.g., 2), it often means your site’s critical rendering path isn’t optimized. While modern users tend to have more powerful devices, excluding low-core users could result in higher bounce rates and lower accessibility for a portion of your audience.
Unhealthy PLS by device CPU cores sample
Slower PLS among users with fewer CPU cores can stem from heavy JavaScript, large layout calculations, or unoptimized main-thread tasks. Even users with 4+ cores might suffer if scripts block rendering or too many resources are competing for attention.
Wider performance gaps between low- and high-core devices often signal that the user experience isn’t consistent — which affects perceived speed, engagement, and retention.
Resolving unhealthy PLS by device CPU cores
Go-to action plan to resolve an unhealthy PLS by device CPU cores:
Ask Uxi to analyze your PLS by device CPU cores and suggest improvements.
Use Filters to identify which pages cause the most slowdown and compare them to other PLS lenses.
Simulate LCP of the suspected lens to see if fixing it will resolve the PLS by device CPU cores. If yes, this is where the resolution focus should be.
Use an automated optimization tool like Navigation AI to improve your PLS by device CPU cores.
Once you’ve improved PLS, set an alert to be the first to know if it starts worsening again.
Try it yourself
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