Delay is 50ms on my MBP. Here is a profile: http://i.imgur.com/ty11Utl.png http://i.imgur.com/ty11Utl.png With the main bottleneck being here: https://github.c

Delay is 50ms on my MBP. Here is a profile: http://i.imgur.com/ty11Utl.png http://i.imgur.com/ty11Utl.png With the main bottleneck being here: https://github.com/BelkaLab/react-yearly-calendar/blob/master/src/Calendar.js#L56-L82 https://github.com/BelkaLab/react-yearly-calendar/blob/maste... Implementing a good shouldComponentUpdate() should fix it.