
Measured via live holdout on production traffic, twelve months into the partnership. Not a launch-day spike, a sustained, compounding result.
Nostra commits to a minimum 3% CVR lift. Performance-based pricing means if they don't clear it, they don't get paid. The floor isn't a goal — it's a promise.
Trust-sensitive category, heavy mobile traffic, paid acquisition, first-time visitors, heavier tech stacks — brands that fit this profile consistently land well above the median.
Every number comes from a live production A/B test — a statistically significant holdout group served the unaccelerated experience, measured against the rest. No attribution models, no synthetic benchmarks.
300+ enterprise and high-growth brands rely on Nostra to deliver instant site speed, stronger SEO performance, deeper personalization, and clean, actionable marketing data.
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Across 317k sessions, Nostra cut Time to First Byte by more than 55% on Carve Designs' top 10 most-trafficked URLs, from the homepage to sale landing pages to new arrivals. Mobile conversion lifted 6.03%, revenue per visitor lifted 5.76%, and the math compounded into a 12.8X return.

Warmies paused Nostra in early October 2025 to run a 30-day in-house Shopify optimization sprint. Their team wanted to see how far they could push site speed through their own theme updates, app cleanup, and Shopify improvements. After the sprint, they turned Nostra back on November 9, 2025 to compare the optimized Shopify stack with Nostra layered back in.

Credo Beauty, the retailer with the highest standards partnered with Nostra to eliminate site speed as a conversion killer - then partnered with Noibu to independently validate the impact.