Reviews (53)

Overall rating
2.5
Counts per rating level
  • 55% of ratings are 5 stars
  • 0% of ratings are 4 stars
  • 6% of ratings are 3 stars
  • 6% of ratings are 2 stars
  • 34% of ratings are 1 stars
May 28, 2025

Customer support is the worst. I have been trying to reach out to customer support for the past two months, but there has been no response. I have never experienced this kind of careless support from any app. I am facing cache issues, some functions are not working on some devices, and some features are visible on some devices but not on others.

Wacoal India
India
About 1 year using the app
Edited April 18, 2025

Company will not reply to any messages or emails.

Update: Only after I left 1-star review, the company did respond with a brief message that didn't clearly answer my question, and then asked me to change my review, but has not replied to my follow up question. I am now trying to use the compress images feature, but an error pops up that I can't read. I believe it wants to ask for more money.

As ...

StrapHabit
United States
Over 1 year using the app
May 29, 2025

The app did nothing to improve performance. When I attempted to uninstall, it left other apps not performing on my site (my new customer form and product reviews no longer function). Shopify confirmed it was due to code from this app screwing up those features. Now I'm left to sort that out because customer support is not responding.

Spectrum Sciences
United States
5 days using the app
Edited May 21, 2025

Scammy and Unreliable – Avoid at All Costs! Charged my account after I uninstalled and I have tried to send messages to get help with fixing and no help and it's almost been a week. It's messing up my shopify website and other billing subscriptions. Do not download and install!!!!! Save yourself the trouble and find another app. You deserve better than shady billing practices and ignored support ...

💙 Blu Rose's Garden LLC 💙
United States
11 days using the app
January 8, 2025

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 ...

Repurposed
United States
About 1 year using the app
February 15, 2025

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.

Sandy Bums Boutique
United States
About 1 year using the app
September 11, 2024

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 ...

Sicilus Srl
Italy
10 months using the app
Dash Labs SIA replied October 10, 2024

Thanks for your review. We have responded to each of your request but it looks like you're not getting our replies. Can you please double check ?

January 16, 2025

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.

Haruhi Beauty
United States
6 days using the app
September 3, 2024

"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 ...

PRINT EXPLORE
Greece
29 days using the app
Dash Labs SIA replied October 10, 2024

Hello,
we have replied to your requests but it looks like you didn't get the replies.
Can you please double check and get back to us via E-Mail info@flash-speed.com

August 17, 2024

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 ...

Inky und Stretchy
Germany
4 days using the app