The setup
We cloned one real WordPress site — a content-heavy WooCommerce store, roughly 4,000 products — and deployed identical copies to two places: a popular regional shared cPanel plan, and a mid-tier IntelliPress isolated container. Same PHP version, same plugins, same theme, same data.
💡 Why this matters
Most “host A vs host B” posts compare different sites on different stacks. Holding everything constant except the hosting is the only way to isolate what the platform itself contributes.
What we measured
We ran each environment through the same battery: time to first byte under load, full page load, and how many concurrent checkouts it could handle before response times degraded.
export const options = {
stages: [
{ duration: '60s', target: 200 },
{ duration: '120s', target: 200 },
],
};The results
Under light load the two were closer than you’d think. Under concurrent load — the moment that actually matters for a store — they diverged sharply.
TTFB (loaded)
840 ms
210 ms
Checkouts/min
~45
~130
The shared plan wasn’t slow because it was cheap. It was slow because it was crowded.
What it means for you
If your site is small and quiet, shared hosting is fine. The moment it earns money, takes traffic, or runs a store, the crowd becomes your ceiling — and that’s exactly where isolation pays for itself.
✓ Key takeaways
- At rest, shared and isolated hosting look similar — the difference shows up under load.
- Isolated containers held ~4× lower loaded TTFB and ~3× more concurrent checkouts.
- The bottleneck on shared hosting is contention, not price.
