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There's no fixed CPU number — it depends on traffic pattern, page cache, DB load and concurrents. But a practical starting point for ~5,000 daily visitors:

Starter (cheap, likely OK if you use caching & CDN): 2 vCPU + 4–8 GB RAM, NVMe SSD.

Recommended (safer for dynamic catalog / images / admin use): 4 vCPU + 8–16 GB RAM, NVMe SSD.

If you expect high peaks or heavy admin/analytics work: 6–8 vCPU + 16+ GB RAM.