Blocksy vs Kadence for a WooCommerce store: shop features, speed and cost

Real-visitor data does not separate them. In September 2026, 50.3% of 23,072 Blocksy origins passed all three Core Web Vitals on mobile, and so did 49.8% of 35,642 Kadence origins. The metrics split rather than stack: Kadence sites pass LCP more often (58.3% against 56.1%), Blocksy sites pass CLS more often (91.6% against 88.6%), and INP is level at 88.3% and 88.9%. Desktop runs the same way, 59.5% against 60.6%. Both sit just above WordPress as a whole at 48.3%. These rows count every site HTTP Archive detected on each theme, blogs and brochure sites included, and the people who pick either theme may simply buy better hosting. So the data supports one conclusion and no more. A store choosing between Blocksy and Kadence for speed is tuning the variable that matters least here.

Blocksy's demo scored 74 and Kadence's 63, just past the 10-point band that run-to-run noise covers in this dataset, and nearly all of it comes from one template. Home pages scored 74 and 63. Shop pages went the other way, 76 for Kadence against 71, with Kadence's main thread blocked for 0 ms. Product pages scored 76 against 59. Kadence's product page drew nothing for 6.7 seconds. Twenty stylesheets, a Google Fonts request and jQuery sat in its render-blocking list, and the gallery image, downloaded within 1.4 seconds, was not painted until 8.5. The same page loads 347 KB of Google reCAPTCHA through the iThemes Security Pro plugin, which cost 900 to 970 ms of scripting per run and lifts the page's JavaScript to 479 KB against 78 KB on the shop page. That is a security setting the demo's builder chose, not Kadence's code. Set it aside and the theme layers are close: 11 KB of Kadence's own JavaScript, Kadence Pro included, against Blocksy's 17 KB with Blocksy Companion. Blocksy's most expensive script comes from its host, too. Cloudflare's bot check took 290 to 390 ms per run on the Blocksy demo, against 40 to 70 ms for Blocksy's main bundle.

The lab comparison is lopsided in a way the scores hide. Kadence's Mega Store demo loads the paid stack, and Blocksy's Modern Shop demo loads the free theme with the free Companion modules, a cookie notice among them, plus WooCommerce's stock PhotoSwipe gallery. None of Blocksy's Shop Extra code for quick view, swatches or filters is on it.

• Kadence Pro on the shop grid: infinite scroll, about 9 KB of script, plus a mega menu
• Kadence Pro on the product page: a sticky add-to-cart bar
• Shop Kit on the product page: a Splide gallery slider, a lightbox, variation swatches, a size chart and accordion tabs, 41 KB in all
• Kadence Blocks and Kadence Blocks Pro on the homepage, including the slider that is its LCP element

Neither demo's cart or checkout was measured, so this axis rests on feature lists. Kadence's Pro bundle includes Flux Checkout, a multi-step checkout that replaces WooCommerce's page, along with Iconic Sales Booster, WooCommerce Delivery Slots and the upsells, cross-sells and order bumps the bundle lists. Blocksy's Business plan keeps WooCommerce's own checkout and works around it: an off-canvas cart, an added-to-cart popup, a free-shipping bar, a quantity input on the checkout page and custom thank-you pages. If the checkout itself is what you want to change, Blocksy is the weaker choice. Treat a multi-step checkout as an experiment with a control group, because it replaces a page that every payment and shipping plugin on the store hooks into. Both demos also load WooCommerce's cart-fragments script on every template, home and shop included, and disabling cart fragments works the same on either theme.

Blocksy Pro's Personal plan, $69 a year, does not include Shop Extra. Business does, at $99 a year or $299 lifetime for up to 10 sites. Kadence's pricing page lists two plans: Pro at $299 a year, with Shop Kit, security, backups and memberships, and Elite at $499 with A/B testing and white-label tools. It states no site count and offers no lifetime license. Over three years one store pays $297 for Blocksy Business on annual billing against $897 for Kadence Pro. The bundle earns back that difference only when its other parts replace bills you already pay, and a store whose managed host already includes daily backups and a firewall would be paying for those twice.

Blocksy shipped 37 versions in 2026, up to 2.1.60 on October 15. The Kadence theme shipped six, the latest 1.5.2 on July 24. Most of Kadence's store features live in its plugins, which keep their own schedules, so a quiet theme changelog says little about Shop Kit. Both demos lag their own vendors: Blocksy's runs 2.1.29 from February 2026 and Kadence's 1.4.2 from November 2025.

Pick Blocksy for a store with straightforward products, under $100 a year to spend on theme features, and someone who will keep the block editor tidy. Pick Kadence when the catalog lives on variations and configuration. WooThumbs variation galleries, Linked Variations, Product Configurator and Bundled Products all come in its bundle, and a Blocksy store would buy each separately. Kadence is the worse choice for a small shop that wants swatches and quick view and nothing else, since it pays $299 a year for a stack it barely touches. Switching later is cheap in both directions. Pages are block markup on both, and Kadence Blocks is a plugin that keeps working under another theme; the header, footer and Customizer settings are what gets rebuilt by hand, as Kadence to Next.js sets out for a move off WordPress entirely. If a store on either theme still fails Core Web Vitals, look past the theme: on both demos the costliest scripts belonged to a security plugin and a host. A free audit splits your own pages by layer, and WoodMart vs Blocksy covers the heavier ThemeForest option.