Benchmark results for https://gist.github.com/pomidoroshev/219ee87b1a138b869c9ce429a2592688

results

▶ for ver in "3.7.1" "3.7.2" "3.7.3" "3.7.4" "3.7.5" "3.8"
do
   echo "\nPython $ver"
   docker run --rm -v `pwd`:/app python:$ver python /app/bench_2.py
done

Python 3.7.1
    # components     |    join_time (μs)    |   buffer_time (μs)   |   concat_time (μs)  
-----------------------------------------------------------------------------------------
10                   |    3.67 (± 0.07)     |     4.1 (± 0.1)      |    3.53 (± 0.08)    
100                  |     30.9 (± 0.8)     |     31.7 (± 0.5)     |       34 (± 1)      
1000                 |      307 (± 7)       |      312 (± 7)       |      340 (± 10)     
10000                |     3100 (± 80)      |     3220 (± 90)      |     3370 (± 70)     

Python 3.7.2
    # components     |    join_time (μs)    |   buffer_time (μs)   |   concat_time (μs)  
-----------------------------------------------------------------------------------------
10                   |     3.7 (± 0.1)      |    4.33 (± 0.08)     |    3.58 (± 0.09)    
100                  |       32 (± 3)       |     32.2 (± 0.6)     |     33.8 (± 0.8)    
1000                 |      300 (± 5)       |      316 (± 8)       |      340 (± 10)     
10000                |     3080 (± 80)      |     3270 (± 90)      |     3340 (± 60)     

Python 3.7.3
    # components     |    join_time (μs)    |   buffer_time (μs)   |   concat_time (μs)  
-----------------------------------------------------------------------------------------
10                   |     3.7 (± 0.2)      |    4.26 (± 0.10)     |    3.50 (± 0.06)    
100                  |       31 (± 2)       |     32.2 (± 0.6)     |       36 (± 7)      
1000                 |      301 (± 7)       |      330 (± 20)      |      335 (± 10)     
10000                |     3080 (± 60)      |     3300 (± 200)     |     3320 (± 50)     

Python 3.7.4
    # components     |    join_time (μs)    |   buffer_time (μs)   |   concat_time (μs)  
-----------------------------------------------------------------------------------------
10                   |    3.11 (± 0.07)     |    3.57 (± 0.07)     |    3.14 (± 0.10)    
100                  |     26.0 (± 0.7)     |     27.9 (± 0.8)     |     28.5 (± 0.7)    
1000                 |      262 (± 5)       |      300 (± 70)      |      279 (± 9)      
10000                |     2720 (± 80)      |     2840 (± 80)      |     2730 (± 60)     

Python 3.7.5
    # components     |    join_time (μs)    |   buffer_time (μs)   |   concat_time (μs)  
-----------------------------------------------------------------------------------------
10                   |    3.01 (± 0.06)     |    3.52 (± 0.07)     |    3.01 (± 0.06)    
100                  |     25.9 (± 0.8)     |       29 (± 1)       |     27.4 (± 0.6)    
1000                 |      260 (± 10)      |      270 (± 10)      |      275 (± 7)      
10000                |     2700 (± 90)      |     2800 (± 100)     |     2700 (± 200)    

Python 3.8
    # components     |    join_time (μs)    |   buffer_time (μs)   |   concat_time (μs)  
-----------------------------------------------------------------------------------------
10                   |    3.39 (± 0.04)     |    3.96 (± 0.07)     |    3.49 (± 0.07)    
100                  |       31 (± 7)       |     30.1 (± 0.5)     |     32.5 (± 0.7)    
1000                 |      287 (± 9)       |      302 (± 10)      |      326 (± 7)      
10000                |     2960 (± 60)      |     3200 (± 200)     |     3210 (± 60)