Map lag when updating entities once per second

Hey, when map is loaded with entities and I want to update some entities once per second (doesn’t really need to be exactly a second) I get a map lag and I can see animation frame took too long in chrome profiler.
BUT when doing TWO consecutive updates every second there is no lag.
You can see the example in this sandcastle (you can see a lag every second in the map rotation and by changing ‘updates’ variable to 2 this behavior stops) :