**Antoine v.d. SwiftLee ** @twannl [2026-05-04](https://x.com/twannl/status/2051278949653635252)Learn about unexpected suspension pointshttps://avanderlee.com/concurrency/unexpected-task-suspension-points-in-swift-concurrency/…🔪 Cutting performance down in two places😲 Silently happening🛠️ Xcode Instruments are golden#swiftlang #iosdev
**Christian A** @Altawesomeee [2026-05-04](https://x.com/Altawesomeee/status/2051366498673840593)The "silently happening" part is what gets you. I had async code I assumed was flying through and it was blocking the whole time.Instruments saved me more than once on this.
**Matt Waller** @wattmaller1 [2026-05-04](https://x.com/wattmaller1/status/2051408743435268373)One day, I will dive into Xcode Instruments more.
**Christian A** @Altawesomeee [2026-05-04](https://x.com/Altawesomeee/status/2051366498673840593)The "silently happening" part is what gets you. I had async code I assumed was flying through and it was blocking the whole time.Instruments saved me more than once on this.
**Matt Waller** @wattmaller1 [2026-05-04](https://x.com/wattmaller1/status/2051408743435268373)One day, I will dive into Xcode Instruments more.