File-based Object Cache is Utterly Slow: An Object Caching Dropin for WordPress that uses the local file system.
As of April 2026, FOCUS Cache is a WordPress cache plugin with 10 active installations and a 5/5 rating from 1 reviews. It has been downloaded 1.8K+ times in total. Requires WordPress 4.3.11+ and PHP false+. Available on WordPress.org since 2017. Last updated 8 years ago — may have compatibility concerns. Top alternative: WP-Optimize – Cache, Compress images….
I needed a persistent object cache while doing work on a budget hosting provider. A lot of the other file-based caching plugins were either bundled with other things I didn’t need (W3 Total Cache), or were old and broken.
On the sites I’ve tested this with, that have slow database servers, I have noticed an increase in page generation times of about 2x. On the other hand, for sites that have fast database servers it can actually increase page generation time. Whenever possible, I’d recommend using Memcached, Redis, or your other quality cache of choice.
I’ve been heavily influenced by redis-cache, wp-redis, W3 Total Cache, and wp-memcached to name a few.
| WordPress | 4.3.11+ requiredTested up to 4.8.28 |
| PHP | false+ required |
includes/ directory resolved the issue. Thanks to @ramonjosegn on the WordPress.org Support Forums for bringing this to my attention.Plugin data sourced from WordPress.org. Analysis and metrics by PluginSift.