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Core Web Vitals Beginner Quick Win Google

Why Page Speed Changes Every Time You Update Your Site (And How To Fix It)

M

Mara Voss

Founder & Lead Editor, PocketSEO

Curated from a practitioner post on Twitter/X

Reviewed Jul 2026

Key Takeaway

Page speed drifts with every image, plugin, and embed you add, so compress images, audit plugins monthly, and lazy-load third-party widgets to keep it fast.

Most site owners check page speed once, then never think about it again

That's a mistake. Your site's loading time shifts constantly — every new image upload, plugin install, or third-party embed changes it.

Why page speed matters more than you think

Google uses Core Web Vitals as a ranking factor. Slow sites get pushed down in search results. But beyond SEO:

  • Bounce rates spike when pages take longer than 3 seconds to load
  • Conversion rates drop 7% for every additional second of load time
  • Mobile users abandon sites faster than desktop users

The 3 changes that improve speed fastest

1. Optimize images before uploading

Images cause 50% of slow loading times. Don't upload 2MB photos straight from your camera.

  • Compress images to under 100KB using TinyPNG or Squoosh
  • Use WebP format instead of JPEG when possible
  • Add proper width and height attributes to prevent layout shifts

2. Audit your plugins monthly

That "helpful" plugin you installed last month might be loading 15 scripts on every page.

  • Deactivate plugins you don't actively use
  • Use tools like Query Monitor to see which plugins slow down your site
  • Replace heavy plugins with lightweight alternatives when possible

3. Clean up third-party embeds

Every YouTube video, social media widget, or chat tool adds external requests.

  • Load videos with thumbnail placeholders instead of auto-embedding
  • Use lazy loading for non-essential widgets
  • Remove analytics scripts you don't actually check

Monitor speed as an ongoing task

Set up monthly Google PageSpeed Insights checks. Your speed score today won't be your score next month.

Treat page speed like you treat content — something that needs regular attention, not a one-time setup.

Want the full playbook? Read our guide on Technical SEO Audits: Which Fixes to Prioritize First.

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