/website-performance/

Website Performance Problems and Fixes

Investigate slow WordPress and WooCommerce sites, poor Core Web Vitals, cache failures, and optimizations that break layouts or scripts.

59 topics · 1 published guides

Common symptoms

Slow front end or slow wp-admin
Poor PageSpeed or Core Web Vitals
Cache showing old content
Site slow after a plugin or theme update
Optimization plugin broke scripts or CSS

Start here

01 Measure TTFB separately from front-end weight
02 Test logged out vs logged in
03 List recent performance plugin changes
04 Check hosting CPU and PHP workers

Most common problems

6 signals

On the board Intermediate

Website is slow

Learn what causes “Website is slow,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

Intermediate Website Performance

WordPress website is slow

Learn what causes “WordPress website is slow,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

Visitors or admins encounter: WordPress website is slow

On the board Intermediate

High server response time

Learn what causes “High server response time,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

On the board Intermediate

Poor Core Web Vitals

Learn what causes “Poor Core Web Vitals,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

On the board Intermediate

Too many plugins slowing website

Learn what causes “Too many plugins slowing website,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

On the board Intermediate

WooCommerce cart fragments slowing website

Learn what causes “WooCommerce cart fragments slowing website,” how to recognize symptoms, and safe steps to diagnose and repair the problem.

All problems in this category

Showing 59 topics · 1 published guides

P1 · intermediate
Website is slow
Learn what causes “Website is slow,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P1 · intermediate
WordPress website is slow
Learn what causes “WordPress website is slow,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
P2 · intermediate
High server response time
Learn what causes “High server response time,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P2 · intermediate
Poor Core Web Vitals
Learn what causes “Poor Core Web Vitals,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P2 · intermediate
Too many plugins slowing website
Learn what causes “Too many plugins slowing website,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P2 · intermediate
WooCommerce cart fragments slowing website
Learn what causes “WooCommerce cart fragments slowing website,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P2 · intermediate
WooCommerce website is slow
Learn what causes “WooCommerce website is slow,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P2 · intermediate
WordPress admin is slow
Learn what causes “WordPress admin is slow,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P2 · intermediate
WordPress cache not working
Learn what causes “WordPress cache not working,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
AVIF images not loading
Learn what causes “AVIF images not loading,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
CDN making website slower
Learn what causes “CDN making website slower,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
CDN not working
Learn what causes “CDN not working,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
CSS optimization broke layout
Learn what causes “CSS optimization broke layout,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Cumulative Layout Shift too high
Learn what causes “Cumulative Layout Shift too high,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Database optimization caused errors
Learn what causes “Database optimization caused errors,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Delay JavaScript broke website
Learn what causes “Delay JavaScript broke website,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
External API slowing website
Learn what causes “External API slowing website,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
First Contentful Paint too slow
Learn what causes “First Contentful Paint too slow,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Google PageSpeed score is low
Learn what causes “Google PageSpeed score is low,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
GTmetrix grade is low
Learn what causes “GTmetrix grade is low,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
High CPU usage
Learn what causes “High CPU usage,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
High memory usage
Learn what causes “High memory usage,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Image optimization not working
Learn what causes “Image optimization not working,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Interaction to Next Paint too high
Learn what causes “Interaction to Next Paint too high,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
JavaScript optimization broke functionality
Learn what causes “JavaScript optimization broke functionality,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Largest Contentful Paint too high
Learn what causes “Largest Contentful Paint too high,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Lazy loading broke images
Learn what causes “Lazy loading broke images,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Memcached error
Learn what causes “Memcached error,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Minification broke website
Learn what causes “Minification broke website,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Not enough PHP workers
Learn what causes “Not enough PHP workers,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Object cache not working
Learn what causes “Object cache not working,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Redis object cache error
Learn what causes “Redis object cache error,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Remove unused CSS broke website
Learn what causes “Remove unused CSS broke website,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Slow DNS lookup
Learn what causes “Slow DNS lookup,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Slow SSL handshake
Learn what causes “Slow SSL handshake,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Slow time to first byte
Learn what causes “Slow time to first byte,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Speed Index too high
Learn what causes “Speed Index too high,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Too many autoloaded options
Learn what causes “Too many autoloaded options,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Too many PHP workers
Learn what causes “Too many PHP workers,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Total Blocking Time too high
Learn what causes “Total Blocking Time too high,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
WebP images not loading
Learn what causes “WebP images not loading,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Website slow after migration
Learn what causes “Website slow after migration,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Website slow after PHP update
Learn what causes “Website slow after PHP update,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Website slow after plugin update
Learn what causes “Website slow after plugin update,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Website slow after theme update
Learn what causes “Website slow after theme update,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Website slow because of advertisements
Learn what causes “Website slow because of advertisements,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Website slow because of analytics scripts
Learn what causes “Website slow because of analytics scripts,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Website slow because of database
Learn what causes “Website slow because of database,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Website slow because of fonts
Learn what causes “Website slow because of fonts,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Website slow because of hosting
Learn what causes “Website slow because of hosting,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Website slow because of images
Learn what causes “Website slow because of images,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Website slow because of plugins
Learn what causes “Website slow because of plugins,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Website slow because of theme
Learn what causes “Website slow because of theme,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Website slow because of third-party scripts
Learn what causes “Website slow because of third-party scripts,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Website slow despite caching
Learn what causes “Website slow despite caching,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Website slow only for logged-in users
Learn what causes “Website slow only for logged-in users,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
Website slow only on mobile
Learn what causes “Website slow only on mobile,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
WordPress cache showing old content
Learn what causes “WordPress cache showing old content,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon
P3 · advanced
WordPress cron slowing website
Learn what causes “WordPress cron slowing website,” how to recognize symptoms, and safe steps to diagnose and repair the problem.
Coming soon

Related categories

Frequently asked questions

Can caching make a site slower? +

Misconfigured page cache, CDN, or delayed JavaScript can hurt TTFB or break critical rendering—especially for logged-in or cart pages.

Repair dispatch

Still Need Help Fixing Your Website?

If you are not comfortable editing website files, changing server settings, repairing a database, or troubleshooting a live website, professional help may prevent additional damage or downtime. We will review the problem before accepting the repair.

You will receive a clear explanation of the likely cause.
We will tell you if the issue falls outside our repair scope.
No additional work will be performed without approval.
A backup should be created whenever access and website condition allow it.

Emergency repair Request diagnosis

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