Worst customer service I have ever experienced. I have been reaching out trying to get help with numerous things since I started using the app and I have never received a response.

I think no one is working on this. I was interested in purchasing the paid plan, but for 4 business days I received 0 support.

I’m not going to give them a 1-star as some did because that seems petty. The app seems to work, although I’ve been trusting their analytics to tell me that. My concern is that they have "usage charges," but I have no idea what they’re for. I searched both the FAQ and documentation for "usage," but got nothing. I sent an email asking, but never got a response. I see a number of other reviews that mention this too and, for the record, I’ve checked my junk mail folders. Because of this and the general need to cut back on paid apps, I’m uninstalling

Terrible support, due to no support, removed the app and it left code in the site that broke features in my store. Had Shopify support involved with the issue and they responded several days later "we refunded the customer" leaving no regard to get the code removed from my website.

Altdaten im Quellcode nach löschen der App. Das führte zu verschiedenen Shop Fehler. Es wurde unteranderem kein Favicon mehr angezeigt und andere Apps wurde im Hintergrund blockiert (z.b. Klaviyo). Damit ist man praktisch gezwungen, die App dauerhaft zu nutzen, weil es sonst zu Problemen im Shop kommt.

Flash speed is great. Their support helped me out quickly to solve some issues I had in the beginning.

Can’t say anything negative about it. Marc & Matiss helped me to fix a few bugs I had in the beginning, since then it works great

Good app that also includes image optimisations. 100 are free each month, but the price per image is cheap.

At first I had problems using the app but the live chat was really helpful and helped me to improve my store.

The results are promising. I will keep the app installed for another few weeks and then review again.

This is a total rip-off! They billed my account with an excessive amount. streetmodestore.com Don't argue with them about this, otherwise they will cleverly bill you.

this app does not work!! too add insult to injury i deleted the app before the new cycle and they still charged me. this is not good business practices

It simply make all your images to fake board at the first loading, then make lazy loading to img, BUT in may cases java have failing and images not show up. page speed goes up immediately but it totally ruin the view overall. second thig: it makes 1K back links from one IP. And support is not answering at all.

I have attempted to contact support repeatedly via both chat and email for several days, with no response. This level of disregard for customers is unacceptable, especially for an app that handles crucial aspects of an online store. While the app may have potential, the complete lack of support makes it unreliable for professional use. I would advise developers to drastically improve their customer service if they want to be taken seriously in the Shopify market. Unless you are willing to troubleshoot every issue yourself, I suggest looking for alternatives with more responsive customer support.

"I'm extremely frustrated with Flash Speed Optimizer. As a paid subscriber, I expected my store to be fully optimized, but there's still a 30% unoptimized score on mobile. This is a serious issue since most of my visitors come from mobile, and it's directly impacting my business negatively. Despite multiple emails and chat messages, I've received zero response. This level of neglect is unacceptable. I demand immediate action to optimize my store and compensation for the damage done to my business due to their inaction. Do not trust this app if you value your business!"

I never write a review, usually only if I´m disappointed. This time it is different. I´m super happy. The app works perfectly for me. from page speed 37 to 95 (I have screenshots to prove it). For me it´s a investment and 20 bucks is not cheap, but I rather pay more for something that really works. The only part I dont use is the picture compressor. Last Thing I really appreciate: no begging for reviews, no upsells. Just the app. Perfect.

This developer doesn't respond to questions on slack or email. I need technical help and I have questions about usage fees. I've had the app for a little over a week now and my website speed hasn't improved. I will be cancelling this subscription before I'm hit with more usage fees.

Best speed optimizer app， they provide good customer service when you encounter the problem they deserve the 5 star

Hello sir Please I contact with you by email still not replying your app was crashed for last few day no one give me reponse to fix it and in your website there no contact us button please help to fix it I am even your paid member

The image optimization helped me to finally pass the core web vitals. Thanks a lot for the support....