This removes some bad code that got spammed into the hottest path of the
driver over time, and makes use of a few new things that didn't exist when the
driver was originally written. Results for glb21 offscreen:
x before
+ after
+--------------------------------------------------------------------------+
| x + |
| x xx xx + |
| x xxx xxxx+ ++ +++ ++ x |
| x x xx+xx*xx****+x ++x+*++ +++ x x + |
|x x x xx+*******x******x+**x+*++ ++++ ++++ * + x x xx+ x +++ ++ +|
| |________|__M__A_______M_A_____|_________| |
+--------------------------------------------------------------------------+
N Min Max Median Avg Stddev
x 63 647.79 698.94 662.05 665.23365 12.512043
+ 65 654.47 707.22 671.6 672.98954 13.209139
Difference at 95.0% confidence
7.75589 +/- 4.46006
1.16589% +/- 0.670451%
(Student's t, pooled s = 12.8708)
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