I was playing 1+0 with engine just to check that the engine is working properly or not but check this game playstrategy.org/je1jCIlgC9Ol . I win against stockfish level 8 . The engine was moving very slowly and taking some time to think and move . Fix this .

Notation's

1. e4 d5 2. exd5 Qxd5 { B01 Scandinavian Defense: Mieses-Kotroc Variation } 3. Nc3 Qe6+ 4. Be2 Qd7 5. Nf3 Nf6 6. d4 e6 7. Ne5 Qd6 8. Bf4 Qb6 9. O-O Nc6 10. Bb5 Bd7 11. Nxd7 Nxd7 12. d5 exd5 13. Re1+ Be7 14. Nxd5 O-O 15. Bxc6 bxc6 16. Nxe7+ Kh8 17. Qxd7 Rad8 18. Qxc6 Qxc6 19. Nxc6 Rde8 20. Kf1 g6 21. Bh6 Rg8 22. Ne7 Ra8 23. Nxg8 Kxg8 { Black wins on time. } 0-1

Thank you for raising this, I have logged an issue and hopefully we can find out why the computer maybe playing too slow.