How does coolant pump speed change warmup time?

It is beneficial that the engine warms up as fast as possible and it was one of the motivations when I installed the electric coolant pump.

Thought to make a quick test to show how pump speed will change the warm up time and result is below:

Test was performed by measuring the time from startup to a point when coolant temp reaches 60 degrees C when fuel enrichment ends.Temp change was then divided with the time it took to reach the temp and giving a value degrees/sec.

As you can see, reducing the pump speed to 10% will decrease the warmup time significantly. One might say why not to turn it off completely? This might not be a good idea since hot pockets might be created if there is no coolant flow at all.

With this change my engine warms up in about 2 minutes from 20 degrees temperature.