Lag

Yes!! it's horrible with GCM 4.10.0.15. I'm using a 6S+ running iOS 11.4.1. Reboot did not help.

Yes, it's terrible. It also kills my battery every time I attempt a sync.

Yes, iPhone X here...

I have the same issue, however it's only the 'My Day' page, the rest of the app works fine.
Force quitting the app doesn't seem to change anything, however I've noticed that if the app crashes and closes "by itself" it's working fine but only for a short time before it starts lagging again.
The issue was definitely introduced by the latest GCM update.

GCM 4.10.0.15
iPhone 6 running iOS 11.4.1
Fenix 5+ running FW 4.20

same here - kills my battery too when syncing

Same here. GCM 4.10.0.15, iPhone 6S running iOS 11.2.6. Since the upgrade to 4.10, the main/my day screen is noticeably slow to repaint/refresh, and while syncing my iPhone battery is massively drained. Has anyone else tried contacting support? Garmin needs to know this update is buggy.

+1 for me too. Force quitting the app and then opening it again seems to clear it up for a little bit, but it always comes back.

Garmin Connect 4.10.0.15
fenix 5 Plus 4.20
iPhone 7 Plus w/iOS 11.4.1

I tried re-installing the app. Worked for a while, but now it's back to massive lag on the 'My Day' page again.

I can't imagine Garmin still being unaware of this unless it turns out that their employees are actually using Android and Suunto or Polar :p

We investigating these reports to determine what is causing the latency in the GCM app. Thanks for the continued discussion.