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Compress images before deploy
Oversized images are still the easiest way to lose LCP before users see anything.
CodeCopy
# Example target for a website hero
source: hero-export.png
resize: 1920px wide
convert: WebP
quality: 78-84
result: 1.2MB -> 156KBTechnology switchboard
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Performance field notes
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LCP, bundles, assets, and measurable speed wins. Each note includes production context, copy-ready examples, and platform-specific advice.
1
BeginnerCompress images before deploy
Oversized images are still the easiest way to lose LCP before users see anything.
2
IntermediatePreload only the critical asset
Preload the hero image or primary font, but avoid turning preload into another bottleneck.
3
AdvancedMeasure route-level bundles
Find heavy dependencies imported into shared layout code before chasing tiny wins.
4
BeginnerReserve media dimensions
Use width, height, or aspect-ratio so images and embeds do not create layout shifts.
5
BeginnerLazy-load below-fold media
Load non-critical images and embeds only when users are likely to see them.
6
AdvancedReduce third-party scripts
Audit tags, widgets, and trackers because third-party JavaScript often dominates real-user slowness.
7
IntermediateCache static assets long
Use hashed filenames and long cache headers so repeat visits avoid downloading unchanged assets.
8
IntermediateMeasure real-user vitals
Use field data to catch slow devices, network conditions, and pages lab tests miss.
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