Optimized preclassical

[micheles]

Here is the USA model:

# before/after
| operation-duration | counts | mean    | stddev | min    | max     | slowfac |
|--------------------+--------+---------+--------+--------+---------+---------|
| preclassical       | 247    | 20.4743 | 201%   | 1.8062 | 640.5   | 31.2844 |
| preclassical       | 280    | 16.8521 | 56%    | 1.4668 | 41.5442 | 2.4652  |

The slowest task is 16x faster!