We released some measures to improve PSI score in our project.
Prior to the release, we measured Lighthouse scores in a verification environment and confirmed that they improved.
However, there was an incident where the score (including each indicator) improved in Lighthouse, but worsened in PSI.
We understand that the scores do not match, but is it possible that the trend of improving/worsening numbers differs between the before and after measures?
Lighthouse：
【Score】 70→74 (improved)
【FCP】 1.0 → 0.6 (improved)
【TTI】3.1→3.0 (improved)【SI】3.6→6.7 (worsened)
【TBT】0→140 (worsened)
【LCP】 2.1→1.6 (improved)
【CLS】 0.207 → 0.048 (improved)
※Conducted in secret mode
PSI：
【Score】 62→44 (worsened)
【FCP】 1.1 → 0.6 (improved)
【TTI】 3.8 → 3.8 (no change)
【SI】 4.8 → 4.6 (improved)
【TBT】 60→250 (worsened)
【LCP】 2.9 → 5.6 (worsened)
【CLS】 0.026 -> 1.081 (worsened)
Incidentally, if you look at the Network tab of the Developer Tools, DOMContentLoaded and Loaded have both improved and are faster to experience.
DOMContentLoaded] 3.06s -> 1.94s Loaded] 4.97s → 3.83s
Which is correct, PSI or Lighthouse?