update

Author: Karl Heinz Struggl

docs/platforms/react-native/overhead/index.mdx

@@ -10,7 +10,7 @@ Adding new features or dependencies to your app incurs additional costs on resou
 
 The SDK is designed to have minimal to no impact on user experience. To achieve this, we utilize an array of tools to continuously measure and optimize the performance of our implementations.
 
-We also employ various techniques to ensure we don't add strain on the system's resources along the hot path - on Mobile, this very often means that we offload processing steps, I/O, and other things to a background thread, or we postpone processing to a later time if possible.
+We also employ various techniques to ensure we don't add strain on the system's resources along the hot path. On Mobile, this very often means that we offload processing steps, I/O, and other things to a background thread, or we postpone processing to a later time if possible.
 
 If you find (for example via local Profiling, or using Sentry to improve the performance of your app) that the SDK does not operate within the guidelines mentioned below, please [open an issue](https://github.com/getsentry/sentry-react-native/issues/new/choose) on our SDK repo and make sure you provide as much context as you can.
 
@@ -45,3 +45,5 @@ As stated in our <Link to="/product/explore/profiling/performance-overhead">prod
 ## Session Replay
 
 As stated in our <Link to="/product/explore/session-replay/mobile/performance-overhead">product docs on the topic</Link>, Session Replay adds some overhead, but should have minimal impact on the performance of your application. For more details on the measured overhead, read the <PlatformLink to="/session-replay/performance-overhead/">performance overhead docs for this SDK</PlatformLink>.
+
+Note that this feature is still under development. We're working on performance improvements to mitigate a known issue where active Session Replay recording can currently introduce slow frames, especially on older iOS devices (for example iPhone 8).