update

Author: Karl Heinz Struggl

docs/platforms/apple/common/overhead/index.mdx

@@ -56,4 +56,6 @@ As stated in our <Link to="/product/explore/profiling/performance-overhead">prod
 
 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).
+
 </PlatformSection>