Comments (3)
Thanks for the info regarding loading=lazy, that could solve it. 🙏
If this is really a "feature", I have to say, I don't think it should be React's business to put stuff into my <head>
automagically…
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This. Tested with 19.0.0-canary-a73c3450e-20240329
.
It would be "kinda" tolerable for the LCP image above fold (featured image or similar), but we have lots of lazy loaded images below fold which contain alternatives like:
<img
{...imgProps}
/>
<noscript>
<img
alt={alt}
src={noscriptSrc}
/>
</noscript>
For every <img>
tag used in noscript, the image is preloaded in <head>
which completely defies the purpose of lazy loading.
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I think this is actually now expected behaviour, after digging the source a bit I found f359f9b
Though I could not find any docs/release notes that mention this which is a little odd as now you need to explicitly think about the loading strategy of every img tag you use. For me I was able to "fix" this by making sure all our img tags have either loading=lazy or fetchPriority=low when they are not to be preloaded, this gave me more or less only the LCP images preloaded.
@nickluger For your case you could either add loading=lazy or fetchPriority=low to the fallback images, though depending on your target browsers you could get rid of the noscript parts these days as loading=lazy has pretty wide browser support now.
Would be good to have this documented somewhere and also maybe add this to the react linter.
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