CircleCI is hiring an Agentic Operator to run many more growth experiments, and every one of them will land on pages that load slowly. Real Chrome visitors wait 6.2 seconds for the homepage's main content (5.2 seconds across the site), so the homepage fails Core Web Vitals. The single biggest cause is in the page head: the InstantSearch library for the header search (about 156 KB) blocks rendering for about 2.6 seconds, together with the Algolia client and nav search script, although most visitors never open search. Slow pages cut conversion on every test and add noise to every readout.
First action
Move the three search scripts out of the head and load them on first search interaction.
How to measure it
Homepage real-visitor LCP (p75)
- Now
- –
- Target
- under 2.5 s
- By
- 90 days
Steps
Confirm the cause
PageSpeed on homepage, pricing and the five compare pages; list render-blocking files.
Web Engineering 1 day
Lazy-load search
Load InstantSearch, the Algolia client and nav search on first focus of the search box.
Web Engineering 2 days
Critical CSS
Inline the hero styles and load the rest without blocking.
Web Engineering 3 days
Trim unused JavaScript
Review the consent script and page-specific bundles.
Web Engineering 3 days
Add a speed gate
No experiment runs on a page whose lab LCP is over 2.5 s.
Agentic Operator, Growth Marketing 1 day
Measure conversion
Signup and demo rate before and after, by device.
Agentic Operator, Growth Marketing 4 weeks
Monitor
Monthly Chrome UX Report for the top 20 pages.
Web Engineering monthly
Why it works
Load the search scripts only when a visitor opens or focuses the search box (or defer them), inline the critical CSS for the hero, and check the consent script's cost. Re-run PageSpeed on the homepage, pricing and comparison pages, and track real-visitor LCP monthly. Treat "LCP under 2.5 seconds on test pages" as a precondition in the experiment process.
It is a small code change with a measurable effect on every channel at once, and it gives the experiment program a faster, cleaner baseline before tests multiply.
Ready to use
ChecklistHomepage speed fix list
[ ] InstantSearch, Algolia client and nav_search loaded on first search focus [ ] Critical hero CSS inlined; main.css non-blocking [ ] Fonts: only the weights used, with font-display swap [ ] Consent script cost reviewed [ ] PageSpeed re-run: homepage, pricing, five compare pages [ ] Speed gate added to the experiment template [ ] Monthly real-visitor LCP report
Risks and how to handle them
Search feels slower on first use
Preload the scripts when the pointer moves toward the search box.
Field data takes 28 days to update
Use lab runs for the weekly check and field data for the monthly report.
Evidence
- Google PageSpeedHomepage on mobile (October 22, 2026): performance score 66; lab Largest Contentful Paint 5.5 s and First Contentful Paint 4.0 s. Real Chrome visitors (75th percentile) wait 6.2 s for the main content and 5.2 s for first paint on the homepage, rated slow, so the page fails Core Web Vitals; across the whole site real-visitor LCP is 5.2 s. The biggest render-blocking file is the InstantSearch library for the header search (about 156 KB, about 2.6 s), loaded in the page head with the Algolia client and the nav search script; PageSpeed estimates 192 KiB of unused JavaScript.Source
- HiringAgentic Operator, Growth Marketing (remote US, posted October 6, 2026): "Most growth teams don't lack ideas. They lack the infrastructure to test them fast enough to matter." The core output is "reducing the time between hypothesis and signal", with agent pipelines for "LLM-evaluated copy variants, synthetic audience testing, funnel drop-off analysis", an automated experiment queue, and stack orchestration across "Amplitude, HubSpot, Clay, REO.dev"; reports to the Director of Demand Generation and works with channel owners, lifecycle, product, PLG and sales. A fit "can describe a specific experiment cadence... 'we went from 3 tests/month to 18'".Source
- Your websiteHomepage: title "Autonomous validation for the AI era"; headline "Validate everything. Assume nothing."; banner "Smarter Testing is GA: Run fewer tests. Get faster feedback."; logo bar Google, Okta, GOAT, Kalshi, Hugging Face. The testimonial carousel mixes older quotes, including a social post about a React Native setup credited to a Twitter handle, a sports club's sponsorship quote, and quotes shown twice; none mentions AI agents or autonomous validation.Source
- Your websitePricing: Free at $0 (up to 6,000 build minutes, up to 5 active users, 30x concurrency); Performance "Starting at $15/month" with 30,000 credits included, $15 per additional user, 80x concurrency and an optional 8x5 support add-on; Scale billed annually via "Get in touch" or "Book a demo". The "Build your plan" calculator recommends credits from active users and builds per month, with prepaid discounts of 2-5%.Source