Frequently Asked Questions
How much can WordPress caching improve site speed?
Browser caching can reduce load times by up to 70%, while object caching can cut database load by up to 95%. The actual improvement depends on your site type and current configuration.
What is the difference between page caching and object caching?
Page caching stores complete HTML versions of pages, eliminating PHP processing for returning visitors. Object caching stores results of complex database queries in memory, reducing database load and PHP execution time.
Do I need a CDN for WordPress caching?
A CDN is not required but highly beneficial for sites with global audiences. It distributes content across multiple servers worldwide, reducing latency and improving load times for visitors in different geographic regions.
What is cache invalidation and why is it important?
Cache invalidation ensures outdated data is refreshed when your site updates. It prevents stale content from being served to visitors and is essential for maintaining site freshness while preserving performance benefits.
What caching tools should I use for WordPress?
Popular options include WP Super Cache and Breeze for page caching, Redis or Memcached for object caching, and Cloudflare or KeyCDN for CDN services. Many managed WordPress hosts offer built-in caching solutions.
How often should I clear my WordPress cache?
Clear cache after major content updates or design changes. For ongoing optimization, set sensible cache TTLs (time-to-live) and use cache warming to preload important pages before the next visit.