Moved isFileExist method to IO thread.
#2651
| Job | Run time |
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| 1h 20m 58s | |
| 12m 50s | |
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| 11m 3s | |
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| 9m 41s | |
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| 1h 32m 6s | |
| 1h 20m 51s | |
| 7m 48s | |
| 7m 48s | |
| 11m 1s | |
| 11m 1s | |
| 6h 0m 0s | |
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| 7m 48s | |
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| 17h 41m 6s |