symfony.com blog sub-navigation

The homepage prefetches the blog page immediately, before any interaction. Does that speed up the click, and how does Firefox compare with Chrome?

Test

URL
https://symfony.com/ → https://symfony.com/blog/
Rule
A list rule with no eagerness, so the default immediate applies: /blog/ is prefetched as soon as the rule is parsed, not on hover or click. 
{"prefetch": [{"urls": ["/blog/"]}]}
Steps
launch → 30s settle → measure load → 5s → click Blog → measure sub-navigation
Variants
firefox — firefox 155.0
firefox_no_specrules — firefox 155.0 (dom.speculation_rules.enabled=false)
chrome — chrome 151.0.0.0
Iterations
10 per variant, fresh browser each

Results

Per-iteration loadEventEnd and LCP for each variant, for the initial navigation and the blog sub-navigation.

Initial navigation → symfony.com

Median, [min–max] and n per metric, in ms.
variantloadEventEndLCP
firefox843 [708–1058] n=10496 [413–724] n=10
firefox_no_specrules866 [759–1163] n=10479 [413–812] n=10
chrome746 [705–1121] n=10512 [468–816] n=10

Blog sub-navigation → symfony.com/blog/

Median, [min–max] and n per metric, in ms.
variantloadEventEndLCP
firefox243 [168–310] n=1071 [57–207] n=10
firefox_no_specrules545 [431–673] n=10342 [315–440] n=10
chrome279 [197–1060] n=10120 [108–500] n=10