by laruence 5 (1 reviews)

Yac Object Cache

Name: Yac Object Cache
Rating: 5.0 (1 reviews)
Author: laruence

Yac (lock-free shared memory) backed object cache for WordPress. Zero external servers, zero network round trips.

Yac Object Cache ranks #55,948 among WordPress.org plugins with 0+ active installations, is #1,352 of 1,518 in the Performance category, a 5/5 rating from 1 reviews, and was last updated Sep 12, 2026. Data from WordPress.org, refreshed twice daily — see methodology.

Compatible with WP 7.1

v1.3.1 Current Version v1.3.1

Updated 3 days ago Last Update on 12 Sep, 2026

Refreshed 12 hours ago Last Refreshed on

#1,352 of 1,518 in Performance Downloads +48.1% this week Actively maintained

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Rank

#55,948

— No change

Active Installs

-3%

KW Avg Position

54.3

0.4 better

Downloads

180

+3 today

Support Resolved

— No change

Rating

100%

Review 5 out of 5

5 (1 reviews)

Next Milestone 10

Total Progress 20%

0+ 10+

30,135

Ranks to Climb

Growth Needed

8,000,000

Active Installs

Pro

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Rank Changes

Current #55,948

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Active Installs Growth

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Active Installs 0,000,000+

Growth +0.0%

Peak 0,000,000

Downloads Growth

Downloads

Growth

Peak

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Reviews & Ratings

5.0

1 reviews

Overall 100%

1 (100%)

0 (0%)

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Plugin Details

Version: 1.3.1
Last Updated: Sep 12, 2026
Requires WP: 5.6+
Tested Up To: 7.1
PHP Version: 7.0 or higher
Author: laruence

Support & Rating

Rating: ★ ★ ★ ★ ★ 5
Reviews: 1
Support Threads: 0
Resolved: 0%

Keywords

cache object cache performance shared memory yac

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Frequently Asked Questions

Common questions about Yac Object Cache

No. That is the point — the cache lives in shared memory on the machine.

The drop-in degrades to a per-request in-memory cache. Your site keeps working; you just lose cross-request persistence. The status page flags the missing extension.

Storage keys are <YAC_OCACHE_KEY_PREFIX>:<group>:<key> (default prefix wp), kept verbatim while they fit the 48-byte budget; over-long keys keep the group verbatim and hash (crc32b) only the key part. Keys carry no per-blog prefix: use a different YAC_OCACHE_KEY_PREFIX per install when sites share one PHP pool; multisite blogs share the namespace.

Yes. wp_cache_flush() calls Yac::flush(), which wipes the entire shared memory on the machine, including data written by other Yac users sharing the PHP pool. The admin page asks for confirmation before flushing.

Yes, with a caveat: blogs of one install share the cache namespace (keys carry no blog prefix), which is fine for most sites; switch_to_blog() does not re-namespace keys. Run separate installs with different YAC_OCACHE_KEY_PREFIX values when blogs must not share entries.

Yac cannot delete entries by prefix, so a group flush clears the request-level copy of that group; shared entries then expire via TTL. The plugin reports flush_group as unsupported so WordPress core does not rely on it.