Investigate Site-Wide Slowness

**Description**

The website is noticeably slow across multiple pages (staging and prod). Investigate the underlying causes and identify improvements to overall site performance.

**Performance targets**

- Initial page load: under **2.5s**
- Largest Contentful Paint (LCP): **≤ 2.5s**
- Interaction to Next Paint (INP): **≤ 200ms**
- Cumulative Layout Shift (CLS): **≤ 0.1**
- Time to First Byte (TTFB): ideally **< 800ms**

**Acceptance criteria**

- All pages across staging and production load under 2.5s.
- Measure results against the performance targets above.
- Identify primary contributors to latency.
- Recommend fixes with expected impact and implementation effort.