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Thanks for your reply,Here the example project I run on XCode 10 and XCode 9.4.1https://www.xn.cx/tmptmp/Test-project.zipHere are the videos, I can clean and run as often as I like the immense performance difference remains always:XCode 9.4.1 https://www.xn.cx/tmptmp/XCode-9.mp4After the debug message "Array contains now 3000 annotations" appears, the application is immediatly visible and scrolling/zooming works smooth without any delays or issues.CPU is more or less ideling as long as I do not zoom/scrollXcode 10 (or 11) https://www.xn.cx/tmptmp/XCode-10.mp4After the debug message "Array contains now 3000 annotations" appears, it takes long before the application window apperars.CPU alsmost all the time 100% when trying to scroll/zoomMemory increases higher than in XCode 9 and much slowlerOnce the app window is visible it looks in the video like I do nothing, but I had the colored spinning mouse pointer while trying to scroll/zoom on the map, and the application freezes for several momentsAt the end after each pin was on the screen once (after zooming out) it performs for futher zooming/scrolling as in the other case.Does this help you to reproduce the problem?