Unexpected increase in `get` speed as the nodes in the cluster are turned off

[ikopylov]

We need to decide if any action is required.

Test results:

No aliens	Avg. Rps	Rps Dev
40 nodes, 0 turned off	2833.02	209.92
40 nodes, 1 turned off	2913.47	83.04
40 nodes, 2 turned off	2936.57	76.04
40 nodes, 3 turned off	2970.33	81.72
40 nodes, 4 turned off	3008.14	79.43
40 nodes, 5 turned off	2999.11	126.92
40 nodes, 6 turned off	3065.44	82.46
40 nodes, 7 turned off	3080.69	72.78
40 nodes, 8 turned off	3123.14	79.28
40 nodes, 9 turned off	3149.05	77.61
40 nodes, 10 turned off	3191.66	77.27

with aliens	Avg. Rps	Rps Dev
40 nodes, 0 turned off	1365.15	662.8
40 nodes, 1 turned off	1674.26	737.74
40 nodes, 2 turned off	1716.97	748.72
40 nodes, 3 turned off	1843.46	710.77
40 nodes, 4 turned off	1851.2	739.85
40 nodes, 5 turned off	1960.82	686.67
40 nodes, 6 turned off	1999.88	680.75
40 nodes, 7 turned off	2026.25	655.1
40 nodes, 8 turned off	2049.89	637.71
40 nodes, 9 turned off	2122.14	619.23
40 nodes, 10 turned off	2094.71	634.14