Rhino 6 Beta > 20X slower than Rhino 5. But now fixed and is 100X faster

Serengeti (Rhino WIP)
2

For me this script gives in Rhino 5 the result:

Command: RunPythonScript
Time to fill matrix =  5.62610626221
Command: RunPythonScript
Time to fill matrix =  6.01433563232
Command: RunPythonScript
Time to fill matrix =  5.74410247803
Command: _CommandHistory
Command: RunPythonScript
Time to fill matrix =  5.95180511475
Command: RunPythonScript
Time to fill matrix =  5.86974334717

and in Rhino BETA

Command: RunPythonScript
Time to fill matrix =  4.31267547607
Command: RunPythonScript
Time to fill matrix =  4.32111358643
Command: RunPythonScript
Time to fill matrix =  4.16295623779
Command: RunPythonScript
Time to fill matrix =  4.35050964355
Command: RunPythonScript
Time to fill matrix =  4.25603485107

Running on an i7-7700 @ 3.6GHz, 16GB RAM, Windows 10 (1709)