Fix race condition by memoizing Tempfile objects
#89
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| 46s | |
| 32s | |
| 30s | |
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| 3m 30s | |
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| 3m 57s | |
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| 4m 7s | |
| 3m 39s | |
| 3m 51s | |
| 9m 32s | |
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| 25m 57s | |
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| 25m 4s | |
| 27m 24s | |
| 25m 39s | |
| 25m 48s | |
| 6h 15m 36s |