Logi Options ver.185.655119.
The application has lots of cool features. However, It uses too way much resources. There has been lots of users reporting the same problem over the internet as well. I my mac, It uses more than 650MB RAM with more than 200 threads with 12 sub apps from Logitech while running the Logi Options app. This is not acceptable. I have to remove the app again and return the keyboard. Logitech should have better QAQC for this software or will loose lots of customers' love and support.