Most CMS sites are not built for traffic. They are built for the traffic the client currently has, with the assumption that growth will be handled "later." Later usually arrives during a product launch or a viral moment — the worst possible time to discover your architecture cannot handle load.
Caching is not optional
Every CMS site serving more than a few hundred visitors per day needs a caching strategy. The layers:
Server-level caching: Nginx or Apache serving cached HTML responses without touching PHP or the database. This is the most impactful single change for WordPress performance.
Object caching: Redis or Memcached storing database query results in memory. A product page that requires 50 database queries cold can serve from memory in microseconds.
CDN caching: Static assets (images, CSS, JS) served from edge nodes close to the visitor. Combined with proper cache headers, this eliminates a massive percentage of origin server load.
Database optimisation
CMS databases grow messy over time. Common issues:
- Thousands of post revisions filling the wp_posts table
- Transient options accumulating in wp_options
- Unindexed columns being queried at scale
Monthly database maintenance — cleaning revisions, flushing transients, running OPTIMIZE TABLE — keeps query performance fast as the site grows.
Load testing before launch
I run every high-traffic project through a load test before launch using k6 or Artillery. Simulating 500 concurrent users reveals bottlenecks before real users encounter them. The fix is almost always caching, database indexing, or unoptimised images.
What happens to your CMS site when 10,000 people visit at once? Here is how to architect for traffic spikes before they happen.
- Abdullah Sajid
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