This one comes from the blogpost: https://medium.com/@krpiotrek/constraintlayout-performance-c1455c7984d7
Here are the results — an average for 1000 iterations on a Android 9.0 Samsung S8 Active device (time in ns, the lower the better)
Linear : inflate: 12800666603 measure: 1944024116 layout: 162693246 total: 14907383965
Relative : inflate: 11924617440 measure: 1827840427 layout: 134245358 total: 13886703225
Constraint: inflate: 12684245264 measure: 2896157869 layout: 150701459 total: 15731104592