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How to Use the Nostra Portal
The Nostra Portal is your window into how Nostra is performing on your store — measured from your real visitors, not lab tests. This guide walks you through logging in and reading every chart on the Speed dashboard.
Welcome
Once Nostra is live on your site, the portal at app.nostra.ai shows you exactly what it's doing for you. Every number you'll see comes from real-user measurement — actual visitors, on actual devices and networks, loading your actual pages.
This first guide covers the Speed section: your Core Web Vitals at the 75th percentile, page-by-page speed for your ten highest-traffic URLs, day-by-day trends, and — if a holdout group is applied to your traffic — a true side-by-side comparison of your site with and without Nostra.
Logging In
Sign in
Use the credentials associated with your work email. These were set up when your store went live on Nostra.
You're in
You'll land on your store's dashboard. Head to the Speed section to see how your site is performing.
Reach out to your Nostra account manager and we'll get you set up. Anyone on your team who works with site performance, analytics, or paid media can have their own access.
The Speed Dashboard
The Speed section answers one question: how fast is your site for real shoppers? It tracks the three timing metrics that matter most — TTFB, FCP, and LCP — across your highest-traffic pages and over time.
At the top of the section, the Device Type filter lets you view all traffic together or narrow the data to a specific device type. Mobile and desktop visitors often have very different experiences, so it's worth checking both.
A map of the Speed dashboard: Web Vitals at p75, per-URI comparisons for each metric, and daily trend charts.
Here's a quick primer on the three metrics before we dig into each chart:
How long the browser waits before your server sends the first byte of the page. This is the foundation — everything else stacks on top of it. Nostra's edge delivery attacks this number directly.
The moment the first piece of content — text, an image, anything — appears on screen. It's the visitor's first signal that the page is actually loading.
When the biggest element in the viewport — usually your hero image — finishes rendering. Google's headline Core Web Vital, and the one most closely tied to conversion.
All three are measured in milliseconds, and for all three, lower is better.
Web Vitals at p75
This chart shows where your store lands against Google's official Core Web Vitals thresholds. For each metric, the colored scale marks the Good, Needs Improvement, and Poor ranges — and the blue Customer bar shows your site's actual value.
The colored scale marks Google's threshold bands; the blue Customer bar is your store's p75 value. The shorter your blue bar, the better — a bar ending inside the green band is rated Good.
Why p75?
These values are measured at the 75th percentile: 75% of your visits are at least this fast. It's the same standard Google uses to evaluate Core Web Vitals, and it's deliberately conservative — instead of an average that a few fast sessions can flatter, p75 reflects the experience of your slower visitors on real networks and devices.
Google's thresholds
| Metric | Good | Needs Improvement | Poor |
|---|---|---|---|
| TTFB | ≤ 800 ms | 800 – 1,800 ms | > 1,800 ms |
| FCP | ≤ 1.8 s | 1.8 – 3.0 s | > 3.0 s |
| LCP | ≤ 2.5 s | 2.5 – 4.0 s | > 4.0 s |
Your Top 10 URIs
Site-wide averages can hide problems, so the portal breaks performance down by page. These three charts show TTFB, LCP, and FCP for your ten highest-traffic URLs — your homepage, top collections, and key product pages.
Each URL gets two bars:
Condensed illustration — the portal shows all ten URIs. The gap between the dark and light bars is Nostra's speed lift on that page; shorter bars are faster.
The LCP and FCP charts work exactly the same way: same ten URIs, same two bars per page, measured for each metric.
Bars are in milliseconds, and shorter is faster. Because both bars measure the same page over the same period on your real traffic, the difference between them is a clean, like-for-like measurement of Nostra's impact — page by page.
Trends Over Time
The over-time charts plot daily values for each metric across your top pages, so you can see how performance holds up day to day — through traffic spikes, sales, and site changes.
Illustrative example — LCP and FCP get the same chart. The vertical distance between the light and dark lines is Nostra's ongoing speed advantage.
Two things to look for. First, the gap: the space between the Without Nostra line and the With Nostra line is the speed improvement Nostra delivers every day. Second, the consistency: the With Nostra line should stay low and flat even when the Without Nostra line drifts or spikes. Because most of your traffic is served through Nostra, the Overall line typically hugs the With Nostra line.
The Holdout Comparison
Everywhere you see Without Nostra in the portal, the data comes from a holdout group: a small, randomly selected slice of your visitors whose sessions bypass Nostra's edge delivery entirely.
This is the same methodology as a scientific control group. Both sets of visitors hit the same pages during the same period on the same site — the only difference is whether Nostra was in the path. That means the deltas you see aren't projections or benchmarks from other sites; they're measured on your own traffic.
That means no holdout group is currently applied to your traffic — the portal will show your overall performance instead. If you'd like to run a holdout comparison, talk to your Nostra account manager about enabling one.
Common Questions
Why don't these numbers match PageSpeed Insights or Lighthouse?
Lighthouse runs a single simulated page load on one throttled device — useful, but synthetic. The portal shows field data: thousands of real visits at the 75th percentile, across every device, browser, and network your shoppers actually use. Field data is what Google uses to evaluate Core Web Vitals, and it's the better reflection of real experience.
Why does the "Without Nostra" line look jumpier than the "With Nostra" line?
The holdout is intentionally a small share of your traffic, so its sample size is smaller and its day-to-day values naturally swing more. Focus on the persistent gap between the lines rather than any single day.
What does p75 mean again?
The 75th percentile: 75% of your visits load at least this fast. It's a deliberately tough standard that reflects your slower, real-world sessions instead of a flattering average.
Which pages appear in the Top 10 URIs charts?
Your ten highest-traffic URLs over the selected period. As your traffic shifts — a new collection takes off, a campaign lands — the list updates to match where your visitors actually are.
Questions about your data? We're here to help.
Your Nostra account manager can walk your team through the dashboard, set up a holdout comparison, or add portal access for teammates.
Open the Portal
