WPVELOCITY DETERMINISTIC SIZING EQUATIONS • UPDATED 2026-11-12
WPVelocity Sizing Methodology: Little’s Law PHP Workers, Redis RAM & Cutover Equations
Most WordPress hosting calculators estimate plans from monthly pageviews alone — an unreliable shortcut because 500,000 cached blog reads require far less compute than 75 simultaneous WooCommerce checkouts. At WPVelocity, we model uncached dynamic concurrency from first-principles queueing math.
WPVelocity Rate Notice: Public rates retrieved 2026-11-12 from each vendor’s official pricing page; promotional introductory discounts and multi-year renewal prices may change at any time — always verify exact billing terms on the vendor’s official checkout page before purchasing.
WPVelocity Open Concurrency Formula (Little’s Law Reference)
// Deterministic WPVelocity Concurrency Model (src/wp-sizer-engine.mjs)
dynamicPhpExecMs = Math.round(site.basePhpMs * pluginMult * redisExecFactor);
sessionRps = concurrentCarts / site.reqIntervalSec;
publicMissRps = ((monthlyVisitors / 2592000) * 4.2) * (1 - effectiveHitRatio);
peakDynamicRps = (sessionRps + publicMissRps) * trafficBurstFactor * flashSpikeMult;
rawActiveWorkers = (peakDynamicRps * (dynamicPhpExecMs / 1000)) / 0.65;
requiredPhpWorkers = Math.max(4, Math.ceil((rawActiveWorkers + cronReserveWorkers) / 2) * 2);
1. WPVelocity Little’s Law Equation for Uncached PHP Workers (L = λ × W)
Every logged-in LearnDash student, WooCommerce cart update, or payment webhook bypasses full-page HTML cache and locks one PHP-FPM or LSAPI worker for W seconds. We calculate peak arrival rate λ from Concurrent Active Carts divided by realistic uncached request intervals (1.7s for active WooCommerce checkout + AJAX fragments, 1.8s for LMS portals, 4.5s for blogs), add cache-miss public RPS, multiply by flash-sale burst factors and plugin-weighted PHP 8.3 execution time W, divide by a 0.65 utilization ceiling to prevent HTTP 502 queue cascades, and add ActionScheduler cron reserves.
2. WPVelocity Redis Object Cache & MariaDB InnoDB Buffer Pool Sizing
Uncached WooCommerce latency spikes sharply whenever wp_options autoload hashes and wp_wc_orders / wp_postmeta indexes miss RAM and read from block storage. Our calculator assigns snapped Redis maxmemory tiers (256 MB, 512 MB, 1,024 MB, 2,048 MB, or 4,096 MB) alongside MariaDB innodb_buffer_pool_size allocations and a mandatory 20% Linux kernel memory buffer so the OOM killer never terminates mysqld during traffic bursts.
WPVelocity: 3. Public Vendor Specification Sourcing (2026-11-12) & Honest Boundaries
All vendor plan matches on WPVelocity reference public specification tables retrieved on 2026-11-12 from ChemiCloud, Hostinger, Vultr, UltaHost, and InterServer. We state clearly that TTFB and concurrency figures are mathematical models based on published hardware specs and software documentation; field benchmark slots remain transparently labeled direct host-level telemetry verification on your target instance rather than fabricated lab claims.
4. WPVelocity Editorial Independence & FTC Referral Governance
WPVelocity is maintained by the WPVelocity Editorial Desk without display ads or gated signups. Outbound /go/ links carry rel="sponsored nofollow noopener" and HTTP 302 no-store headers; qualifying purchases may earn WPVelocity a partner commission at zero extra cost to you while never altering our deterministic Little’s Law worker output.