Real World Speed Improvements
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Transcript of Real World Speed Improvements
@jennyhalasz#pubcon
Jenny Halasz• In SEO since 2000 – 16 years!• Speaker at Pubcon, SMX, SES, StateofSearch,
InternetSummit, Conversion Conference…• Writer for Search Engine Land & Search Engine
Journal• Contributing Author “SEO Now” and “SEO Like
I’m 5”
@jennyhalasz#pubcon
In Reality…DOM=13.2 seconds!!!
DOM=Document Object Model (don’t look up “define dom”)
@jennyhalasz#pubcon
Classify the Problem
Legacy infrastructur
e
Improve back end
Can’t dump cache
Akamai
Only supports jpg
Best practices
Image size Compression
Less than 50K
3rd parties
Tagging Contracts
Enforcement
@jennyhalasz#pubcon
Baby Steps
Use CDN
Implemented minor code changes
Fix cache problem, cache what we can
Progressive enhancement strategy
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Optimize Images
Implement AIC (Adaptive Image Compression)
Fix hero images and sliders to be less than 70K
Change process
Fix largest legacy images
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Compression Tactics
DNS-Prefetch
Minify CSS/JS
Enable response compression using Gzip
@jennyhalasz#pubcon
Scale imagesJS/CSS enhancementsCachingHSTSHTTP/2Progressive enhancementDefer JS loadMake fewer requestsAdd expires headersReduce DNS lookupsAvoid redirectsControl 3rd party tags