Guo Xiang Tan 80e348d226 PERF: Speed up slow tests in our test suite.
Before

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Finished in 7 minutes 23 seconds (files took 4.15 seconds to load)
7145 examples, 0 failures, 10 pending
```

After

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Finished in 6 minutes 12 seconds (files took 4.41 seconds to load)
7145 examples, 0 failures, 10 pending
```
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