@fera
Hello,
wow, your measurement is pretty bad, I am sorry. I wonder why that is :/ Locus Map will have some increased tolerance (10 seconds delay) but we won't increase it any more because it would only cover up this buggy behavior and you would still be missing the real data.
I will try to switch to newer communication API and use more light-weight messages for HRM synchronization with hopefully lower overall latency in the next version, maybe it will help.
By the way do you have any battery optimizations enabled on your phone? If so, could you try to disable them for Locus Map, Wear for Locus Map and Wear OS apps and see if that helps or if it is the same?
Thanks!