Time in seconds for a "make -j16 buildkernel" on an entire 16-core AWS Graviton 1 machine:
```
x before.a1.4xlarge
+ after.a1.4xlarge
+------------------------------------------------------------------------------+
| + |
| ++ |
| ++ + xx x |
| + ++ + xx x x x |
| + * ++ + +x* *x*x* xxx xx x |
|+ + + ++x x **+*+ **x+x* +******x** xx++ + x * + +x xx+x x|
| |________|_M__A______M_A_____|_______| |
+------------------------------------------------------------------------------+
N Min Max Median Avg Stddev
x 50 323.91 325.08 324.29 324.33 0.25847275
+ 50 323.64 324.9 324.105 324.168 0.26796284
Difference at 95.0% confidence
-0.162 +/- 0.104462
-0.0499491% +/- 0.0322085%
(Student's t, pooled s = 0.263261)
```