HeadSpin Proposes Speed Optimizations as Largest Catch for Fishbrain


Overview and Methodology For Our Analysis




iPhone 8 / Verizon / Miami

Products Used:

HeadSpin Connected Intelligence Platform


  • Review multiple 3rd party SDKs that cause slowdown in launch time
  • Type of images used
  • Optimize connection reuse
  • HeadSpin analyzed version 8.2.0 of the Fishbrain iOS app on a real iPhone 8 in Miami, on the Verizon network.
  • NO SDK, code change or instrumentation was needed to run the remote performance sessions.
  • HeadSpin’s AI engine sifted through network traffic, client-side metrics, and videos of the test execution to find areas of poor user experience and performance bottlenecks.
  • Recommendations were provided for every issue that was surfaced.

User Reviews

Fishbrain is doing very well overall in terms of user ratings on the App Store.

HeadSpin looked at Fishbrain reviews in the App Store and found some users struggling with functional issues and technical errors.

Fishbrain ratings is currently 4.7/5 on the App Store.


Insights and Recommendations

HeadSpin’s proprietary AI technology analyzes and prioritizes the core issues impacting critical user journeys. Using computer vision techniques to quantify blank screens, time to interact, loading time, loading or buffering animations, and content quality, our AI models can automatically diagnose server-side issues whether they arise from infrastructure deployment issues, poor performance, or API errors. For a custom analysis of your app, request a Performance Insight report from HeadSpin. 

HeadSpin Performance Session (link)

Top KPIs

   Launch Time      14696 ms   
Sign Up Time8396 ms
Search Time2271 ms


Top Issues

  • Review 3rd party SDKs and APIs and load them when needed and asynchronously.
  • Reuse connections
  • Use Webp over Jpeg to compress images
Launch Time — 14696 ms

Launch time for the app was 14696 ms. There are many slow API calls taking place during launch which could be contributing to this slowdown. The snapshot on the left shows some of those calls, you can see them all by clicking on the session link.

These were the slowest calls:
POST to RevenueCat endpoint

HEADSPIN RECOMMENDATION: It took nearly 15 seconds for the app to launch, and many calls to 3rd party APIs and SDKs took place during this time. See if you can load these resources asynchronously so the user is not stuck waiting for the app to launch.
Connection Reuse

We noticed connection reuse issues with Fishbrain hosts, where new connections were opened instead of reusing already existing ones. 36 instances of this issue were noticed on the rutilus.fishbrain host, and 40 on the Cloudfront host.

HEADSPIN RECOMMENDATION: Creating new connections instead of reusing existing ones introduces unnecessary overhead and consumes unnecessary resources on the device.

Image Type — Compressing images is crucial

We noticed that your app is requesting jpeg files for images. Review the jpeg files and see if you can compress the images using image scaling tools.


How to Work With HeadSpin

HeadSpin Powers Flawless Mobile App Performance

HeadSpin’s state-of-the-art Digital Experience Intelligence Platform™ will empower your engineering teams to:

  • Execute automation tests on real carrier-enabled devices worldwide
  • Discover performance bottlenecks
  • Collect and visualize your performance data
  • Seamlessly integrate with your CI/CD workflow
  • Monitor every critical user flow of your mobile experience
  • Pinpoint issues that cause performance regressions and impact user experience earlier in your development cycle
Overarching Areas of Opportunities

  • Launch new features confidently by monitoring and analyzing root causes of performance issues throughout the development life cycle
  • Drive new user installs and user engagement with optimized performance
  • Forge user trust and safety, accelerating consumer services for critical user paths across your apps and website
  • Benchmark KPIs for mobile performance to understand how your user experience for your mobile app and website compares to your peers in the same industry
  • Support localized testing across 32,000+ devices and 160+ countries around the world, on real devices under real-world conditions
Expert Holistic Consultation and Strategy 

HeadSpin has the product and solutions expertise to help you perfect the digital experience for your customers! Our team hails from digital pioneers, such as Google and Facebook, and has already delivered enhanced mobile-centric experiences for a diverse set of Fortune 1000 clients. HeadSpin’s strategic insights can help you:

  • Drive new user acquisition, user engagement, and feature adoption
  • Deploy app security measures on iOS and Android
  • Build consistent performance standards and experiences across all your mobile apps and websites 

... insight from HeadSpin helps us prioritize issues so we could deliver a better user experience.

Maria Zhang, CTO, Tinder