Does Progressier affect your website’s performance?

In short? Not at all.
Progressier doesn’t slow down your website—not even by a millisecond.

The Progressier script is loaded using the defer attribute. That means it’s downloaded in parallel with the rest of your page and only runs once everything else has finished loading. In other words, it doesn’t block other resources or interfere with rendering in any way.

As for the Progressier manifest, it behaves like any other web app manifest—it loads only after the page has fully loaded, so by design, it has no impact on load times.

You might have seen tools like GTmetrix or PageSpeed Insights flagging Progressier during their scans. That’s expected—and here's why:

The Progressier script is served through Cloudflare, and we’ve configured it to block bots.

These performance tools are essentially automated bots that visit your site. When they try to load our script, Cloudflare blocks them, which may cause the tools to report a “missing” or “delayed” resource.

This is part of how we keep Progressier so affordable—just $25/month, no matter how much traffic your site gets. Blocking non-essential bot traffic is one of several optimizations that help us minimize infrastructure costs while still delivering a fast, seamless experience for your real users.

While tools like GTmetrix or PageSpeed Insights are helpful for spotting general issues, they rarely reflect real user experiences. These tools run under fixed conditions, without accounting for things like caching, return visits, bot blockers, or geographic differences. If you want to understand how your site truly performs, it’s better to rely on empirical data from actual user visits.

If your site doesn’t feel slow—and users aren’t saying it is—then spending effort on tweaking scores for these tools may not be the most meaningful investment.