At the moment it seems to be taken offline (Only gives "Internal Server Error") - will update the review if/when it is back online.

Installation nicht möglich. Man installiert, zahlt und die App verlangt erneut die Gebühr - VORSICHT. 2 Mal die Gebühr bezahlt und geht immer noch nicht. Habe dem Support beide Rechnungen geschickt, die behaupten, ich hätte nicht bezahlt. shopify bestätigt die beiden Zahlungen, doch den Betreiber interessiert es nicht wirklich anstatt die App frei zu schalten, wurde ein Shopzugriff verlangt nur um mir zu sagen, dass ich angeblich nicht bezahlt habe, genau. Und alle Nachweise wie Rechnungen und so sind ja egal, weil Betreiber meint man hätte nicht bezahlt. Man kann sicherlich sein Geld auch anders ausgeben, ein Burger wäre hier deutlich effektiver als die App

Não funciona … Fiquei semanas esperando correção pelo suporte e sem retorno agradável .. Não indicado

KRAZY! That's all I can say. What a totally brilliant app. For a measly $10 our Pagespeed score went up >25%. How can you beat that? Try the app – you'll see. And then once you experience what we've experienced – continue to periodically rerun the app from time to time, to sort out changes that you make to your store. Possibly the best $10 investment ever!

I wouldn't say I like leaving negative reviews, but what can you do if support doesn't reply and the app that I had to pay for to try it out does not work and simply breaks the template? The support started ok, with about a 3-day wait, but they did fix one issue after reporting that the app was still not working and had removed the cart buttons. No replies from my support ticket at all. I chased them up 3 times and never heard from them again. I would avoid this app as you will lose your money by $10 and get little to no support.

The app does a more measurable progress on mobile download speed increasing First Contentful Paint which was around 3.4 s on a collection page, now app installed it is about 1.3 s. Overall our Google Pagespeed score increased around 5 - 8 points for the same collection page.

A quick and easy way that made our site snappier with first visits and slower connections where the browser needs to initial cache. This did not make lighthouse faster for us, perhaps a misconception of what critical CSS does, but it does make real world load time faster and lowered our blocking time.

Hasn't worked for me, took my Google Page Speed Score on Mobile from mid 20s to low 30s only. Unfortunately Developer said did not have time to help.

This has to to the best app in the shopify apps store to help you be successful. I will admit I am using FLEX so I had really good page load but with Critical CSS 1.32 sec loading time. Never been able to achieve that with many attempts with other themes. I think I have the right combo now. Thank you!

"Instant pagespeed increase for $10... yeah right?!" That's exactly what I said when I saw this app but thought I'd give it a go anyway, SO GLAD I DID! Having spent a few days trying to boost the speed of our store and only getting marginal gains my research lead me to this app. The install was super easy and instantly flagged up some unseen errors in my CSS (blame my template creators for that!), once I fixed those the app did its thing and added a snippet to the head for the critical css, I could then confidently move all the remaining stuff to the end of the body. I ran a pagespeed test before installation on the different page types and again after installation (plus cache clearing). I'm happy to report a very significant pagespeed increase across all pages! I had a few noob questions and the support was spot on and helpful. Honestly, this is a seriously good value for money app and really worth trying!