31 July 2026
This week in caching: VCL cookie hygiene, before/after Cookies quietly destroy hit rate. The teams who fixed it: — Publisher — analytics cookies (_ga, _fbp) made every request 'unique' to Varnish; stripping them in vcl_r…
@CacheCatch
30 July 2026
This week in caching: Redis eviction & stampede war stories The subtle Redis failures, with the fix metrics: — High-traffic API — default noeviction policy filled Redis, then every write threw OOM errors and the app fell…
@CacheCatch
29 July 2026
This week in caching: WP page-cache plugins benchmarked Numbers from folks who actually A/B'd their plugin: — Agency site — moving from a generic cache plugin to one with proper preloading kept the cache warm; cold-load …
@CacheCatch
28 July 2026
Reading rec If this channel's your speed, @RPMReceipts runs a sharp feed on site monetization. Different angle, same depth — worth a follow.…
@CacheCatch
27 July 2026
This week in caching: edge vs origin, the latency gap What moving the cache closer to users actually did: — EU store, US buyers — caching full HTML at CDN edge (not just assets) dropped Sydney TTFB from 940ms to 70ms; th…
@CacheCatch
26 July 2026
This week in caching: browser cache headers, measured wins Small header changes, real repeat-visit numbers: — SaaS dashboard — adding Cache-Control: max-age=31536000, immutable to fingerprinted JS/CSS cut repeat-view req…
@CacheCatch
25 July 2026
This week in caching: invalidation done right Case studies in not nuking the whole cache on every edit: — Magazine, 200k articles — switching from full purge to tag-based purge (Varnish xkey) on publish dropped the post-…
@CacheCatch
24 July 2026
This week in caching: Varnish under traffic spikes What full-page caching at the edge of origin actually buys you: — News site, election night — Varnish in front of WordPress served 96% of requests from RAM; origin saw 3…
@CacheCatch
23 July 2026
This week in caching: OPcache tuning case files Three shops that stopped leaving free performance on the table: — Laravel app, 1.4k files — raising opcache.memory_consumption from 128M to 256M and max_accelerated_files f…
@CacheCatch
22 July 2026
This week in caching: Redis object cache, the receipts Real numbers from teams who swapped MySQL transient hell for a persistent object store: — WooCommerce store, 40k products — moving wp_options autoloaded transients i…
@CacheCatch
21 July 2026
This week in caching: warming the cache before users do Three on pre-populating instead of waiting for the first cold visitor. — sitemap-driven warmers — crawl your own sitemap.xml post-deploy so the first real user hits…
@CacheCatch
20 July 2026
This week in caching: how to actually debug a cache Four tools for "is this thing even caching?" — read the right headers — X-Cache: HIT/MISS, CF-Cache-Status, X-Cache-Hits, Age. The Age header alone tells you object fre…
@CacheCatch
19 July 2026
This week in caching: invalidation that isn't just short TTLs Three reads on the famously hard problem. — tag-based over time-based — invalidate by what changed (this product, this author), not by guessing a TTL. Cache t…
@CacheCatch
18 July 2026
Neighbor spotlight: @PingbackClinic. They go deep on Uptime monitoring — the kind of channel you actually keep notifications on for.…
@CacheCatch
17 July 2026
This week in caching: scaling the Redis cache tier Three for when one Redis box stops being enough. — Sentinel for HA, Cluster for shards — Sentinel gives failover on a single dataset; Cluster splits keys across nodes. P…
@CacheCatch
16 July 2026
This week in caching: the Vary header, friend and foe Three reads on the most quietly destructive response header. — Vary: User-Agent shreds your cache — thousands of UA strings means near-zero shared-cache reuse; almost…
@CacheCatch
15 July 2026
This week in caching: the cache layer in the browser you control Three on Service Worker caching — the most underused tier. — stale-while-revalidate as a strategy, in code — Workbox's StaleWhileRevalidate serves from Cac…
@CacheCatch
14 July 2026
This week in caching: revalidation done right (304s) Three pieces on conditional requests — the half of caching people skip. — ETag vs Last-Modified — ETags are precise but break across load-balanced servers if not norma…
@CacheCatch
13 July 2026
This week in caching: cache your failures too Three on negative caching — the cheap win nobody configures. — cache 404s briefly — a flood of requests to a missing URL otherwise hammers origin every time; proxy_cache_vali…
@CacheCatch
12 July 2026
This week in caching: WP page-cache plugins, sorted Four for WordPress folks choosing a stack. — W3 Total Cache for control, not comfort — granular object/page/db/fragment caching; powerful, easy to misconfigure into a s…
@CacheCatch
11 July 2026
This week in caching: who wins when headers fight Three reads on CDN vs browser directive precedence — a top source of "why won't this cache" tickets. — s-maxage overrides max-age for shared caches — set a long edge TTL …
@CacheCatch
10 July 2026
This week in caching: full-page cache vs the logged-in user Three on the hardest FPC problem: personalization. — ESI for the dynamic island — Edge Side Includes cache the page but punch a hole for the cart/greeting; Varn…
@CacheCatch
09 July 2026
This week in caching: edge vs origin, and the soft purge in between Three pieces on where to invalidate. — soft purge beats hard purge — Fastly's soft purge marks objects stale (serve-stale-while-revalidate) instead of e…
@CacheCatch
08 July 2026
Reading rec If this channel's your speed, @HandshakePapers runs a sharp feed on SSL / HTTPS. Different angle, same depth — worth a follow.…
@CacheCatch
07 July 2026
This week in caching: stopping the thundering herd Three reads on what happens the instant a hot key expires. — probabilistic early expiration — the XFetch algorithm (Vattani et al.) refreshes a key slightly before TTL w…
@CacheCatch
06 July 2026
This week in caching: Varnish for people past the quickstart Four for anyone running VCL in anger. — grace mode is the killer feature — std.healthy() plus a grace window serves stale during backend outages; this is Varni…
@CacheCatch
05 July 2026
This week in caching: the cache-key mistakes that quietly kill hit rate Three pieces on why your cache is "working" but never hitting. — Vary: Cookie is a hit-rate grenade — any unique cookie fragments the cache per-user…
@CacheCatch
04 July 2026
This week in caching: getting more out of OPcache than defaults give you Four items for PHP folks who set opcache.enable=1 and stopped there. — opcache.preload for framework hot paths — PHP 7.4+ preloading pins Symfony/L…
@CacheCatch
03 July 2026
This week in caching: making your cache observable You can't tune what you can't see. Curated: — The four numbers to graph — hit ratio, eviction rate, memory used vs max, and average key age; what each one tells you when…
@CacheCatch
02 July 2026
This week in caching: caching the absence of things The underrated half: caching 404s, empty results, and errors: — Negative caching to stop origin abuse — caching 404s briefly so a scanner hitting 10k bad URLs doesn't p…
@CacheCatch
