Does Nosto slow down a store?
In 7IT’s test of 367 US online stores, Nosto ran on 16 of them (4.4%). On the median store that loads it, it downloaded 53 KB and kept the phone busy for 0.00 s before the page could respond.
4.4%of 367 US stores run it
53 KBmedian download on stores that load it
0.00 smedian time the phone spends running it
Stores with it and without it.
| Stores | Median score | Main content | Blocking time | Apps on the page | |
|---|---|---|---|---|---|
| With Nosto | 16 | 31 | 11.6 s | 1243 ms | 27 |
| Without | 351 | 34 | 11.7 s | 1281 ms | 20 |
Stores that run Nosto had a median score of 31, against 34 for stores without it. They also run more apps overall (a median of 27 against 20), so that gap is not all Nosto’s doing. The size and phone time above are Nosto’s own. On this sample there is no score penalty that can be pinned on it.
One in four stores that load it download more than 57 KB of it, and spend more than 0.06 s running it. Median Google phone-lab results, home pages only, September 2026. Method and limits in the study.
If you run Nosto.
- Upsell and recommendation widgets belong after the main content. Load them after the product or cart content has rendered.
- Check the revenue the widget reports against what it costs in speed on the pages it runs on.