Why is my lighthouse performance-score inconsistent between tests?
Asked on Sep 23, 2025
Answer
Lighthouse performance scores can vary due to several factors, including network conditions, device performance, and server response times. These fluctuations are common and can affect the consistency of your scores.
Example Concept: Lighthouse runs performance audits using a simulated environment, which can be influenced by factors like CPU throttling, network speed, and server load at the time of testing. Variations in these conditions can lead to different performance scores across multiple tests.
Additional Comment:
- Network speed and latency can vary, affecting load times and scores.
- Background processes on your testing device can impact CPU availability.
- Server response times might fluctuate due to load or geographic distance.
- For more consistent results, use a controlled environment or a dedicated testing tool like PageSpeed Insights.
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