Reduce JavaScript bundle size — without re-launching your site
Measurable Lighthouse uplift, gated by CI so it sticks
- Senior engineers · IST + EST overlap
- NDA on day 1
- 24-hour reply
Tell us what you need fixed
Reply in 24 hours · NDA on day 1 · No spam.
What you're seeing
Your main bundle ships 800kB+ to every visitor, including third-party SDKs they will never use.
Our approach
We tree-shake aggressively, code-split per route, dynamic-import every modal/SDK, and replace heavyweight libraries with lighter alternatives. Bundles drop 50%+ without losing features.
Symptoms teams come to us with
- Lighthouse and PageSpeed scores stuck in the red on mobile
- Visitors bounce before the hero or content paints
- Search Console flags Core Web Vitals as "Poor" on key URLs
- The site feels fast on your laptop but crawls on real phones
What we check first
- Oversized JavaScript bundles and unused third-party SDKs
- Render-blocking CSS, fonts and tag-manager scripts
- Unoptimised images and a missing modern image pipeline
- Slow TTFB from cold starts, slow queries or chatty APIs
Concrete deliverables, no fluff
Every engagement ends with measurable, documented outcomes — no black-box agency reports.
- RUM-driven audit with line-level fix list
- Implementation of every critical fix
- Before/after metrics with screenshots
- CI performance gate to prevent regression
From brief to shipped fix
A transparent, low-risk process — a senior engineer reads your brief personally, and nothing starts until you approve a written plan and price.
01
Diagnose
A senior engineer reviews your brief, reproduces the issue, and pinpoints the real root cause — not the symptom — before any code is touched.
02
Scoped plan & quote
You get a written plan to reduce JavaScript Bundle Size, a firm timeline, and a fixed quote. Nothing starts until you approve it — no surprise invoices.
03
Ship the fix
We implement on a branch and open a pull request you review, working to your code-review standards on your repo — never a black box.
04
Verify & hand off
We verify on staging and production, share before/after evidence where it applies, and leave you a short hand-off note so the fix sticks.
Why teams hand this task to Krapton
Senior engineers only
Your brief is read and handled by a senior engineer — no junior hand-off, no sales-rep filter in between.
Root cause, not a patch
We reproduce and fix the underlying cause, then add a guard so the same class of issue does not quietly return.
Your repo, your standards
Every change lands as a pull request you review, on your repository, following your existing review process.
NDA on day one
Confidentiality and IP are covered before we look at a single line of code. All work stays in your accounts.
Fixed quote up front
You approve a written plan and price before work starts. If scope changes, we re-quote in writing — no surprise invoices.
Proof, where it applies
Performance, SEO and reliability work ships with before/after evidence so the result is measurable, not anecdotal.
Three ways to engage
No retainer required. Pick the model that matches the work — pricing for this task starts from $1,500, with a fixed quote before anything starts.
Per task
Most popular
One clearly-scoped fix at a fixed price. Best when you know exactly what is broken and want it handled end to end.
- Fixed quote up front
- One PR, reviewed by you
- No retainer required
Hourly
Pay only for the hours worked. Best for diagnostics, audits, or exploratory work where the scope is still emerging.
- Weekly timesheets
- Pay for what you use
- No minimum commitment
Per sprint
A focused 1–2 week sprint when the work is bigger than one fix but smaller than a full project.
- 1–2 week blocks
- Clear sprint goal
- Scale up or stop anytime
Industry-standard stack, no proprietary lock-in
Reduce JavaScript bundle size — your questions, answered
How much does it cost to reduce JavaScript Bundle Size?
Pricing starts from $1,500 and depends on the scope we find during the diagnostic. You get a fixed, written quote before any work begins — most engagements like this run 1–2 weeks.
How long does it take to reduce JavaScript Bundle Size?
Typically 1–2 weeks for a focused engagement. After a short diagnostic we commit to a firm timeline so you know exactly what to expect.
Will you work directly on our existing codebase?
Yes. We work on your GitHub, GitLab or Bitbucket, ship every change as a pull request you review, and follow your code-review standards — not ours.
What exactly will I have at the end?
Concrete, documented outcomes — RUM-driven audit with line-level fix list, Implementation of every critical fix, Before/after metrics with screenshots, and more. No black-box agency report.
How quickly can you start, and do you sign an NDA?
For a focused task like this we can usually start within 24–48 hours of the brief. We sign an NDA on day one, before we look at any code — yours or ours.
Will this improve my Core Web Vitals and Google rankings?
Directly. We fix the metrics Google actually ranks on — LCP, INP and CLS — on real-user data, then lock the gains in with monitoring so they don't regress. Better field metrics typically support better rankings on competitive queries.
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Keep exploring
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Let's get this off your plate
Send a 60-second brief on Reduce JavaScript Bundle Size and a senior engineer replies within 24 hours with a plan and a fixed quote. NDA on day one, no retainer required.