"My site feels slow but I can''t say where" — one of the vaguest briefs. The cost of a second slower is concrete: Google''s research shows bounce probability rises sharply from 1s to 3s. For e-commerce that''s lost orders; for B2B, lost inquiries. Optimization has measurable metrics (Core Web Vitals), a clear process, and real costs.
Fits vs Doesn't Fit
| Worth optimizing | Not yet |
|---|---|
| LCP > 2.5s, high bounce | Very low traffic; content not speed |
| Image-heavy, uncompressed | Not launched, architecture undecided |
| Has traffic, wants conversion | Real issue is bad UX flow |
| Peak traffic before a campaign | Budget for one thing, bottleneck is copy |
Alternatives Matrix
| Option | Pros | Cons | Cost |
|---|---|---|---|
| DIY cache plugin | Cheap, partial win | Band-aid; misconfig bugs | NT$0–5K |
| Performance SaaS | Fast, global nodes | Monthly, limited custom | NT$1K–10K/mo |
| Custom optimization | Root-cause fix | Needs diagnosis, upfront cost | NT$30K–120K |
Full Process (Tools & Deliverables)
- Stage 1 Diagnosis (2-3d): PageSpeed Insights + WebPageTest for LCP/INP/CLS. Deliverable: audit report.
- Stage 2 Front-end (3-5d): WebP/AVIF, lazy-load, inline critical CSS, drop unused JS. Deliverable: before/after.
- Stage 3 Delivery (2-3d): CDN (Cloudflare/Vercel), Brotli, cache headers. Deliverable: CDN config doc.
- Stage 4 Backend & DB (3-7d): query tuning, indexes, Redis cache. Deliverable: slow-query list.
- Stage 5 Acceptance (1-2d): core pages LCP < 2.5s, mobile passing. Deliverable: acceptance report + monitoring.
Real Cost Breakdown
- Build: diagnosis+front-end ~NT$30K–50K; full ~NT$60K–120K.
- Hidden: CDN monthly (Cloudflare free, Pro ~US$20/mo), image-CDN bandwidth, monitoring subs.
- Labor trap: poor code turns optimization into refactor — review code before quoting.
Reality vs Imagination
- Thinks "a plugin makes it fast"; reality: plugins only touch front-end, useless when LCP is a big image or slow API.
- Thinks "only 100 counts"; reality: conversion is the goal, 90 with LCP < 2.5s is fine.
- Thinks "optimize once forever"; reality: every redesign and tag regresses performance.
Common Pitfalls × Fixes
- Desktop-only → make mobile Core Web Vitals the standard.
- CDN before compressing images → optimize images first.
- Third-party tags slowing first paint → defer non-critical scripts.
- Over-aggressive cache → long-cache static, short-cache HTML.
- No monitoring after optimizing → set alerts at launch.
Success Metrics + 90-Day Roadmap
- 30d: mobile LCP < 2.5s, INP < 200ms, CLS < 0.1.
- 60d: bounce, dwell, conversion vs before.
- 90d: review Search Console Core Web Vitals turning green; hunt regressions.
Decision Checklist
- ☐ Is my mobile LCP over 2.5s?
- ☐ Images numerous and uncompressed?
- ☐ Measurable conversion goals affected by speed?
- ☐ Peak traffic before a campaign?
- ☐ Zero performance monitoring now?
- ☐ Many third-party tags added last year?
- ☐ Willing to pay monthly for monitoring?
- ☐ Source code quality good?
FAQ
How soon will I see results?
Front-end and CDN gains are measurable on launch day; business metrics need 2-4 weeks of data.
Isn't a cache plugin enough?
Plugins solve part of the front-end but can''t touch big images, slow APIs, or DB queries.
Could optimization break my site?
A proper process works in staging, verifies item by item, and keeps rollback points.
Call to Action
Want to know where your site is slow and whether it''s worth optimizing? We offer a free performance check-up.
- Email: [email protected]
- Phone: 0916-224-047
- LINE: @ufv9089p