WordPress Speed Optimization Checklist (2026) — Pass Core Web Vitals

A slow site costs you rankings and sales. This checklist walks through the highest-impact fixes — in priority order — to pass Google's Core Web Vitals and load fast. Tick items off, then Print → Save as PDF.

1 Measure first

Phase 1 · Baseline

Run PageSpeed Insights & a waterfall testTest a real page (not just the home page) on mobile and desktop; save the score to compare after.
Read your Core Web VitalsLCP (loading), CLS (layout shift) and INP (interactivity) — note which one is failing first.
Find your biggest bottleneckUsually a slow server response (TTFB), an unoptimized hero image, or render-blocking scripts.
Change one thing at a timeRe-test after each fix so you know what actually helped.

2 Fix hosting & the server

Phase 2 · Foundation (biggest wins)

Use fast, well-spec'd hostingCheap shared hosting is the most common cause of high TTFB. Managed WordPress hosts fix most of this for you.
Run a current PHP versionNewer PHP is significantly faster; upgrade in your host panel and test.
Enable server-level & object cachingRedis/Memcached object cache and server page cache (often built into managed hosts).
Pick a data center near your audienceDistance adds latency; choose the region closest to most visitors.

3 Caching & CDN

Phase 3 · Caching

Enable full-page cachingServe static HTML to visitors instead of rebuilding pages on every request.
Add a CDNServe assets (and cached pages) from edge locations worldwide for faster delivery.
Set long browser-cache headersLet returning visitors reuse cached assets instead of re-downloading them.
Exclude carts/checkout/logged-in pagesDon't cache dynamic/personalized pages — only static ones.

4 Images & media

Phase 4 · Media (usually the heaviest bytes)

Compress every imageMost pages ship images far larger than needed; compress on upload.
Serve modern formats (WebP/AVIF)Much smaller than JPEG/PNG at the same quality.
Set width/height & lazy-load below the foldDimensions prevent layout shift (CLS); lazy-loading defers offscreen images.
Optimize the LCP imagePreload the hero image and do NOT lazy-load it — it's your largest paint.

5 Code, scripts & theme

Phase 5 · Front-end weight

Minify & combine CSS/JSReduce file size and requests; test carefully for breakage.
Defer/async non-critical JavaScriptRender-blocking scripts delay LCP and INP; defer what isn't needed immediately.
Audit and remove unused pluginsEach plugin can add scripts/queries; deactivate and delete what you don't use.
Limit web fonts & self-host themFewer weights, font-display: swap, and host locally to cut requests.
Use a lightweight themeBloated page-builder themes are a common speed killer; prefer lean ones.

6 Database & upkeep

Phase 6 · Maintenance

Clean post revisions, drafts & spamBloat slows queries; prune regularly (keep a backup first).
Optimize database tablesRemove orphaned data and overhead from old/removed plugins.
Re-test and set a monitorConfirm the score improved, then watch Core Web Vitals over time.

80/20 rule: hosting + caching + image optimization fix the large majority of slow WordPress sites. Start there before micro-tweaking code.

The fastest fix: faster hosting

Managed WordPress hosts handle PHP, server caching, object cache and CDN for you — the foundation fixes above, done by default. These are well-rated options; links go to each official site. Confirm current pricing before buying.

Affiliate disclosure: some links below are affiliate links — if you buy through them we may earn a commission at no extra cost to you.

KinstaManaged WP · Google Cloud CloudwaysManaged cloud · built-in cache WP EngineEnterprise managed WP NexcessAuto-scaling WP/WooCommerce SiteGroundPerformance shared/cloud