Table of Contents
Why Performance is Both a UX and SEO Priority
Google's Core Web Vitals are now ranking factors. Largest Contentful Paint (LCP), First Input Delay (FID/INP), and Cumulative Layout Shift (CLS) directly impact your search rankings. Beyond SEO, performance directly affects conversion rates — Amazon's research found every 100ms of latency costs 1% in sales.
Server-Level Optimizations
1. Use NVMe Storage
Database query times drop by 50–70% when migrating from SATA SSD to NVMe storage. If your hosting plan doesn't include NVMe, upgrade immediately.
2. Enable HTTP/2 or HTTP/3
HTTP/2 allows multiplexing multiple requests over a single TCP connection, eliminating the head-of-line blocking problem of HTTP/1.1. In NGINX: add listen 443 ssl http2;
3. Configure Server-Side Caching
For WordPress: install WP Rocket or LiteSpeed Cache. For custom applications: Redis or Memcached for object caching. For static sites: NGINX FastCGI cache.
4. GZIP/Brotli Compression
Compressing text responses (HTML, CSS, JavaScript) reduces transfer sizes by 60–80%.
Image Optimization
5. Convert Images to WebP or AVIF
WebP files are 25–35% smaller than JPEG at equivalent quality. AVIF is even smaller. Use cwebp or ImageMagick for batch conversion.
6. Implement Lazy Loading
Add loading="lazy" to img tags below the fold. This defers image loading until the user scrolls to them, dramatically improving initial page load time.
Database Optimization
7. Add Database Indexes
Analyze slow query logs: SET GLOBAL slow_query_log = 1; SET GLOBAL long_query_time = 1;. Add indexes for frequently queried columns.
8. Use Connection Pooling
PgBouncer for PostgreSQL and ProxySQL for MySQL reduce connection overhead for high-traffic applications.
FAQ
What is a good TTFB (Time to First Byte)?
Under 200ms is excellent. Under 500ms is acceptable. Above 800ms indicates server-side performance issues requiring investigation.
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