How I Would Fix slow pages and weak Core Web Vitals in a Circle and ConvertKit founder landing page Using Launch Ready.

How I Would Fix slow pages and weak Core Web Vitals in a Circle and ConvertKit founder landing page Using Launch Ready

The symptom is usually obvious: the page feels sluggish, the hero takes too long to appear, and mobile visitors bounce before they ever see the offer. In business terms, that means lower conversion, worse ad efficiency, and a landing page that looks less trustworthy than it should.

The most likely root cause is not one single bug. It is usually a mix of heavy third-party scripts, unoptimized images, too many font loads, and a page built quickly inside Circle with ConvertKit embeds that were never tuned for performance.

The first thing I would inspect is the actual waterfall in Chrome DevTools and PageSpeed Insights, then I would check what Circle is injecting into the page and how ConvertKit forms are loading. If I can see render-blocking scripts, oversized media, or duplicate tracking tags in the first screenful of HTML, I already know where most of the delay is coming from.

Triage in the First Hour

1. Open the live landing page on mobile emulation in Chrome DevTools. 2. Run Lighthouse for mobile and record:

• LCP
• CLS
• INP
• Total blocking time
• Largest transfer size assets

3. Check PageSpeed Insights for field data and note whether the issue is lab-only or real user traffic. 4. Inspect the Network tab for:

• Third-party scripts
• Font files
• Uncompressed images
• Duplicate analytics tags
• Slow ConvertKit embed requests

5. View source and identify what Circle is adding automatically. 6. Review all active integrations:

• ConvertKit forms
• Analytics
• Heatmaps
• Chat widgets
• Pixel tags

7. Check DNS, SSL, redirects, and Cloudflare status if the domain setup recently changed. 8. Confirm whether any custom code was pasted into Circle headers or footers. 9. Verify if there are multiple tracking tools fighting each other. 10. Review console errors for failed scripts or broken form behavior.

A quick diagnostic command I would use during triage:

npx lighthouse https://your-domain.com \
  --preset=mobile \
  --only-categories=performance \
  --output=json \
  --output-path=./lighthouse-report.json

That gives me a repeatable baseline before I touch anything.

Root Causes

1. Heavy third-party scripts Circle pages often get slowed down by analytics, chat widgets, social pixels, A/B tools, and form embeds all loaded at once. I confirm this by checking which requests block rendering and which scripts add the most main-thread time.

2. Unoptimized hero media A large background video or oversized hero image can destroy LCP on mobile. I confirm this by checking the file size, image dimensions, format, and whether the asset loads above the fold before any text appears.

3. Render-blocking fonts and CSS If too many font weights are loaded or CSS arrives late, the page may look blank or unstable during load. I confirm this by inspecting waterfall timing and looking for layout shifts when fonts swap in.

4. ConvertKit embed overhead ConvertKit forms can be fine, but poorly embedded forms can add extra JS execution or delayed rendering. I confirm this by comparing load time with the form disabled versus enabled.

5. Poor hosting or caching setup If DNS is messy, Cloudflare is not configured correctly, or cache headers are weak, every visit pays full price for assets again. I confirm this by checking response headers, cache hit ratio, and whether static assets are being cached at the edge.

6. Security-related bloat from rushed setup Founders often paste multiple snippets into headers without inventorying them first. From an API security lens, every extra script is another supply-chain risk and another place where data can leak through poorly scoped tracking or form handling.

The Fix Plan

My goal is to make the page faster without breaking lead capture or creating a bigger mess inside Circle.

1. Reduce script count first I would remove anything non-essential from the initial load:

• chat widget
• heatmap tool
• duplicate pixels
• unused A/B testing code
• old marketing snippets

Only keep what directly supports conversion or attribution.

2. Move non-critical scripts off the critical path Anything not needed to render above-the-fold content should load after interaction or after page idle time where possible. That includes analytics extras and secondary widgets.

3. Compress and resize all hero assets I would replace oversized images with WebP or AVIF where supported, crop to actual display size, and serve responsive variants for mobile and desktop.

4. Simplify fonts I would limit fonts to one family if possible and reduce weights to two or three max:

• regular
• medium
• bold

If brand allows it, system fonts are often faster than custom font stacks on a founder landing page.

5. Make ConvertKit lighter I would keep only one form per primary conversion path and avoid loading multiple embedded forms on one page unless they are truly needed. If possible, I would use a lighter embed pattern or defer non-critical form enhancements until after first paint.

6. Put Cloudflare in front properly With Launch Ready, I would configure:

• DNS cleanup
• correct redirects
• SSL enforcement
• caching rules for static assets
• DDoS protection defaults
• subdomain hygiene

This reduces repeated network work and protects against common traffic spikes.

7. Tighten security while fixing performance This matters because founder landing pages often collect email addresses through several tools at once.

I would check:

• SPF/DKIM/DMARC alignment for email deliverability
• secret handling for API keys in environment variables only
• least privilege on any connected accounts
• no exposed tokens in client-side code
• no unnecessary third-party access to subscriber data

8. Verify production deployment safely I would ship changes behind a controlled rollout if possible:

• test on staging first
• compare before/after Lighthouse scores
• verify redirects still work
• confirm SSL is valid on apex and www domains

That scope fits this problem well because speed issues on these pages usually come from bad launch plumbing as much as from bad design.

Regression Tests Before Redeploy

Before shipping anything back to production, I would run these checks:

1. Performance targets Acceptance criteria:

• LCP under 2.5s on mobile where realistic network conditions allow it
• CLS under 0.1
• INP under 200ms for primary interactions
• Lighthouse performance score above 85 on mobile

2. Conversion path checks Acceptance criteria:

• CTA button works on iPhone Safari and Android Chrome
• ConvertKit form submits successfully
• confirmation message appears without layout jump
• no duplicate submissions on refresh

3. Visual stability checks Acceptance criteria:

• no major content shift when fonts load
• hero section stays stable during image load
• no broken spacing after script removal

4. Security checks Acceptance criteria:

• no secrets visible in browser source or client bundles
• only required domains are allowed for external requests where practical
• forms do not expose subscriber data in console logs or URL params

5. Cross-browser checks Acceptance criteria:

• Chrome latest works on desktop/mobile
• Safari latest works on iPhone/iPad if relevant to your audience of founders and operators in US/UK/EU markets

6. Basic accessibility checks Acceptance criteria:

• buttons have clear labels
• contrast is readable on mobile outdoors conditions where possible
• form inputs have labels tied correctly to fields

7. Monitoring checks Acceptance criteria:

• uptime monitor fires correctly if page returns 5xx or times out
• DNS points to expected destination after deployment
• SSL certificate renews cleanly

Prevention

I would not treat Core Web Vitals as a one-time cleanup task. They need guardrails so the page does not regress every time someone adds a new widget.

What I recommend:

| Guardrail | Why it matters | | --- | --- | | Monthly Lighthouse check | Catches slow creep before ads waste money | | Script inventory | Prevents duplicate pixels and bloated embeds | | Image size rule | Stops oversized hero media from hurting LCP | | Change review checklist | Reduces accidental breakage from quick edits | | Secret handling policy | Keeps API keys out of public code | | Monitoring alerts | Warns you before downtime costs leads |

For API security specifically, I would keep an eye on every integration that touches user data:

• only use trusted providers with clear scopes,
• rotate exposed keys immediately,
• avoid over-sharing subscriber fields,
• review webhook endpoints,
• log failures without logging private payloads.

From a UX angle, founders usually need one clear CTA above the fold plus enough trust signals to justify action fast enough for cold traffic from ads or social posts.

When to Use Launch Ready

Use Launch Ready when you already have a working Circle + ConvertKit landing page but it is costing you leads because it loads slowly or feels unstable on mobile.

It is a good fit if you need:

• domain setup fixed properly,
• email authentication configured,
• Cloudflare added,
• SSL enforced,
• deployment cleaned up,
• secrets moved out of unsafe places,
• monitoring turned on,

What you should prepare before booking: 1. Admin access to Circle. 2. Admin access to ConvertKit. 3. Domain registrar access. 4. Cloudflare access if already connected. 5. Any existing analytics accounts. 6. A list of current integrations and scripts. 7. Your primary conversion goal: waitlist signup, booked call, paid trial, or download.

If your landing page is losing conversions because it feels slow or fragile, I would fix launch infrastructure first instead of redesigning everything blindly.

References

1. Roadmap.sh Frontend Performance Best Practices: https://roadmap.sh/frontend-performance-best-practices 2. Roadmap.sh API Security Best Practices: https://roadmap.sh/api-security-best-practices 3. Roadmap.sh QA: https://roadmap.sh/qa 4. Google Web.dev Core Web Vitals: https://web.dev/vitals/ 5. Cloudflare Docs: https://developers.cloudflare.com/

---

Take the next step

If this is a problem in your product right now, here is what to do next:

• [Use the free Cyprian tools](/tools) - estimate cost, score app risk, check launch readiness, or pick the right service sprint.

• [Book a discovery call](/contact) - I will tell you honestly whether you need a sprint or if you can DIY the next step.

*Written by Cyprian Tinashe Aarons - senior full-stack and AI engineer helping founders rescue, launch, automate, and scale AI-built products.*