Why Concurrency Matters More Than Single-User Speed
Most hosting benchmarks test a single page load from one location. That tells you almost nothing about real traffic. A server returning 50ms TTFB for one visitor may degrade to 800ms when 50 visitors arrive simultaneously — because the PHP-FPM pool is saturated or the database connection pool is exhausted. This benchmark tests eight managed WordPress hosts under progressive load from 1 to 100 simultaneous users.
Cached Page Concurrency Results
| Host | TTFB at 10 VUs | TTFB at 50 VUs | TTFB at 100 VUs | Error Rate |
|---|---|---|---|---|
| Kinsta | 48ms | 52ms | 61ms | 0% |
| WP Engine | 89ms | 95ms | 108ms | 0% |
| Nexcess | 78ms | 88ms | 105ms | 0% |
| Cloudways | 112ms | 145ms | 201ms | 0.1% |
| SiteGround | 134ms | 198ms | 320ms | 0.8% |
| Bluehost Managed | 198ms | 410ms | 890ms | 3.2% |
Mixed Traffic Results (70% Cached / 30% Dynamic)
| Host | P95 at 50 VUs | P95 at 100 VUs | Error Rate |
|---|---|---|---|
| Kinsta | 210ms | 380ms | 0% |
| WP Engine | 380ms | 620ms | 0% |
| Cloudways | 620ms | 1,100ms | 0.8% |
| SiteGround | 890ms | 2,400ms | 2.4% |
| Bluehost Managed | 1,800ms | timeout | 12%+ |
Key Findings
Premium hosts (Kinsta, WP Engine, Nexcess) show less than 30% TTFB degradation from 10 to 100 concurrent users on cached pages — proper Nginx configuration ensures cached pages never touch PHP or MySQL. The mixed-traffic scenario is the real differentiator: at 100 VUs, budget hosts that performed acceptably at single-user loads showed P95 response times above 2 seconds. Dynamic page concurrency is the metric that separates premium from budget hosting.
Recommendations by Traffic Level
| Monthly Traffic | Recommended Host Tier |
|---|---|
| Under 10k pageviews | Any managed host — basic caching sufficient |
| 10k–100k pageviews | WP Engine, Nexcess, Flywheel |
| 100k–500k pageviews | Kinsta, WP Engine Pro |
| 500k+ pageviews | Kinsta, or VPS with custom infrastructure |
FAQ
How many concurrent users can managed WordPress hosts handle?
For cached pages: most managed hosts handle 100+ concurrent users without degradation. For dynamic/uncached pages: premium hosts handle 50–100 concurrent dynamic requests; budget hosts typically saturate at 10–20 concurrent users.