General info

We need to bring Largest Contentful Paint (LCP), Time to Interactive (TTI), and overall page responsiveness in line with Google’s recommended thresholds across our Homepage, /bags listing page, and Product Detail Pages.

Recent Lighthouse audits on mobile show LCP values as high as 5–6 s, with known issues such as delayed hero image loading, inefficient image formats, render-blocking CSS/JS, unused or legacy scripts (like the HiPay SDK running globally), and insufficient caching.

Because 80% of our traffic is mobile, we focus on mobile-first performance, but many improvements will benefit desktop as well.

The goal is to systematically remove confirmed bottlenecks, follow best practices for Core Web Vitals, and deliver a faster, more reliable experience for all visitors.

Epic ticket:

Epic User Story

As a customer browsing saclab.com, I want all core pages – including the homepage, bags listing, and product pages – to load fast and interact smoothly so that I feel confident exploring, selecting, and purchasing items.

Acceptance Criteria

This EPIC is fully covered by three focused stories, each addressing verified performance bottlenecks on a specific page type:

1. Homepage

2. /bags product feed page

3. Product detail page

Screenshots and attached Lighthouse reports often highlight Mobile performance issues as the priority – this is intentional, since around 80% of our traffic is mobile.

However, many Acceptance Criteria (such as optimising image formats, removing render-blocking CSS/JS, or deferring third-party scripts) will have a positive impact on both mobile and desktop.

We adopt a mobile-first approach, but expect improvements across all device types.

Note for developers:

All recommended actions and configuration tips in the individual stories are provided as a directional starting point only.

The dev team should validate what’s technically feasible, adapt to our theme and plugins, and test thoroughly in staging to ensure stable, measurable PageSpeed gains.