Very slow at the end (>=1.30)

[passlab]

1.31: instead of 10 min --> 28 min

./oclHashcat64.bin -a 6 -m 1000 --markov-disable --status --status-timer=240 --logfile-disable --restore-disable --potfile-disable NT.txt 76.dict ?a?a?a?a
oclHashcat v1.31 starting...

Generating dictionary stats for 76.dict: 28396 bytes (100.00%), 3000 words, 244351875000 keyspace

Generated dictionary stats for 76.dict: 28396 bytes, 3000 words, 244351875000 keyspace



INFO: approaching final keyspace, workload adjusted

[s]tatus [p]ause [r]esume [b]ypass [q]uit =>

Session.Name...: oclHashcat
Status.........: Running
Input.Base.....: File (76.dict)
Input.Mod......: Mask (?a?a?a?a) [4]
Hash.Target....: File (NT.txt)
Hash.Type......: NTLM
Time.Started...: Fri Dec 5 13:02:41 2014 (3 mins, 59 secs)
Time.Estimated.: Fri Dec 5 13:12:27 2014 (5 mins, 44 secs)
Speed.GPU.#1...: 105.0 MH/s
Speed.GPU.#2...: 107.8 MH/s
Speed.GPU.#3...: 106.4 MH/s
Speed.GPU.#4...: 106.0 MH/s
Speed.GPU.#*...: 425.3 MH/s
Recovered......: 0/65 (0.00%) Digests, 0/1 (0.00%) Salts
Progress.......: 100260335616/244351875000 (41.03%)
Skipped........: 0/100260335616 (0.00%)
Rejected.......: 0/100260335616 (0.00%)
HWMon.GPU.#1...: 90% Util, 40c Temp, 80% Fan
HWMon.GPU.#2...: 89% Util, 46c Temp, 80% Fan
HWMon.GPU.#3...: 90% Util, 40c Temp, 80% Fan
HWMon.GPU.#4...: 89% Util, 44c Temp, 80% Fan



Session.Name...: oclHashcat
Status.........: Running
Input.Base.....: File (76.dict)
Input.Mod......: Mask (?a?a?a?a) [4]
Hash.Target....: File (NT.txt)
Hash.Type......: NTLM
Time.Started...: Fri Dec 5 13:02:41 2014 (7 mins, 59 secs)
Time.Estimated.: Fri Dec 5 13:12:24 2014 (1 min, 41 secs)
Speed.GPU.#1...: 106.2 MH/s
Speed.GPU.#2...: 106.4 MH/s
Speed.GPU.#3...: 106.4 MH/s
Speed.GPU.#4...: 106.2 MH/s
Speed.GPU.#*...: 425.1 MH/s
Recovered......: 0/65 (0.00%) Digests, 0/1 (0.00%) Salts
Progress.......: 201526185984/244351875000 (82.47%)
Skipped........: 0/201526185984 (0.00%)
Rejected.......: 0/201526185984 (0.00%)
HWMon.GPU.#1...: 91% Util, 42c Temp, 80% Fan
HWMon.GPU.#2...: 89% Util, 47c Temp, 80% Fan
HWMon.GPU.#3...: 91% Util, 41c Temp, 80% Fan
HWMon.GPU.#4...: 89% Util, 44c Temp, 80% Fan



Session.Name...: oclHashcat
Status.........: Running
Input.Base.....: File (76.dict)
Input.Mod......: Mask (?a?a?a?a) [4]
Hash.Target....: File (NT.txt)
Hash.Type......: NTLM
Time.Started...: Fri Dec 5 13:02:41 2014 (12 mins, 0 secs)
Time.Estimated.: Fri Dec 5 13:15:25 2014 (42 secs)
Speed.GPU.#1...: 33141.1 kH/s
Speed.GPU.#2...: 1228.8 kH/s
Speed.GPU.#3...: 1074.5 kH/s
Speed.GPU.#4...: 1402.1 kH/s
Speed.GPU.#*...: 36846.5 kH/s
Recovered......: 0/65 (0.00%) Digests, 0/1 (0.00%) Salts
Progress.......: 230825953472/244351875000 (94.46%)
Skipped........: 0/230825953472 (0.00%)
Rejected.......: 0/230825953472 (0.00%)
HWMon.GPU.#1...: 79% Util, 41c Temp, 80% Fan
HWMon.GPU.#2...: 79% Util, 46c Temp, 80% Fan
HWMon.GPU.#3...: 78% Util, 39c Temp, 80% Fan
HWMon.GPU.#4...: 79% Util, 43c Temp, 80% Fan



Session.Name...: oclHashcat
Status.........: Running
Input.Base.....: File (76.dict)
Input.Mod......: Mask (?a?a?a?a) [4]
Hash.Target....: File (NT.txt)
Hash.Type......: NTLM
Time.Started...: Fri Dec 5 13:02:41 2014 (16 mins, 0 secs)
Time.Estimated.: Fri Dec 5 13:19:02 2014 (19 secs)
Speed.GPU.#1...: 33768.6 kH/s
Speed.GPU.#2...: 1248.5 kH/s
Speed.GPU.#3...: 1094.2 kH/s
Speed.GPU.#4...: 1404.5 kH/s
Speed.GPU.#*...: 37515.8 kH/s
Recovered......: 0/65 (0.00%) Digests, 0/1 (0.00%) Salts
Progress.......: 239607251392/244351875000 (98.06%)
Skipped........: 0/239607251392 (0.00%)
Rejected.......: 0/239607251392 (0.00%)
HWMon.GPU.#1...: 90% Util, 41c Temp, 80% Fan
HWMon.GPU.#2...: 91% Util, 46c Temp, 80% Fan
HWMon.GPU.#3...: 90% Util, 39c Temp, 80% Fan
HWMon.GPU.#4...: 90% Util, 43c Temp, 80% Fan



Session.Name...: oclHashcat
Status.........: Running
Input.Base.....: File (76.dict)
Input.Mod......: Mask (?a?a?a?a) [4]
Hash.Target....: File (NT.txt)
Hash.Type......: NTLM
Time.Started...: Fri Dec 5 13:02:41 2014 (20 mins, 0 secs)
Time.Estimated.: Fri Dec 5 13:22:45 2014 (2 secs)
Speed.GPU.#1...: 1312.2 kH/s
Speed.GPU.#2...: 0 H/s
Speed.GPU.#3...: 0 H/s
Speed.GPU.#4...: 0 H/s
Speed.GPU.#*...: 1312.2 kH/s
Recovered......: 0/65 (0.00%) Digests, 0/1 (0.00%) Salts
Progress.......: 243867829168/244351875000 (99.80%)
Skipped........: 0/243867829168 (0.00%)
Rejected.......: 0/243867829168 (0.00%)
HWMon.GPU.#1...: 92% Util, 40c Temp, 80% Fan
HWMon.GPU.#2...: 0% Util, 32c Temp, 80% Fan
HWMon.GPU.#3...: 0% Util, 29c Temp, 80% Fan
HWMon.GPU.#4...: 0% Util, 30c Temp, 80% Fan



Session.Name...: oclHashcat
Status.........: Running
Input.Base.....: File (76.dict)
Input.Mod......: Mask (?a?a?a?a) [4]
Hash.Target....: File (NT.txt)
Hash.Type......: NTLM
Time.Started...: Fri Dec 5 13:02:41 2014 (24 mins, 0 secs)
Time.Estimated.: Fri Dec 5 13:26:45 2014 (1 sec)
Speed.GPU.#1...: 1288.8 kH/s
Speed.GPU.#2...: 0 H/s
Speed.GPU.#3...: 0 H/s
Speed.GPU.#4...: 0 H/s
Speed.GPU.#*...: 1288.8 kH/s
Recovered......: 0/65 (0.00%) Digests, 0/1 (0.00%) Salts
Progress.......: 244179280816/244351875000 (99.93%)
Skipped........: 0/244179280816 (0.00%)
Rejected.......: 0/244179280816 (0.00%)
HWMon.GPU.#1...: 90% Util, 40c Temp, 80% Fan
HWMon.GPU.#2...: 0% Util, 31c Temp, 80% Fan
HWMon.GPU.#3...: 0% Util, 28c Temp, 80% Fan
HWMon.GPU.#4...: 0% Util, 29c Temp, 80% Fan



Session.Name...: oclHashcat
Status.........: Exhausted
Input.Base.....: File (76.dict)
Input.Mod......: Mask (?a?a?a?a) [4]
Hash.Target....: File (NT.txt)
Hash.Type......: NTLM
Time.Started...: Fri Dec 5 13:02:41 2014 (26 mins, 15 secs)
Time.Estimated.: 0 secs
Speed.GPU.#1...: 1281.7 kH/s
Speed.GPU.#2...: 0 H/s
Speed.GPU.#3...: 0 H/s
Speed.GPU.#4...: 0 H/s
Speed.GPU.#*...: 1281.7 kH/s
Recovered......: 0/65 (0.00%) Digests, 0/1 (0.00%) Salts
Progress.......: 244351875000/244351875000 (100.00%)
Skipped........: 0/244351875000 (0.00%)
Rejected.......: 0/244351875000 (0.00%)
HWMon.GPU.#1...: 85% Util, 40c Temp, 80% Fan
HWMon.GPU.#2...: 0% Util, 31c Temp, 80% Fan
HWMon.GPU.#3...: 0% Util, 28c Temp, 80% Fan
HWMon.GPU.#4...: 0% Util, 29c Temp, 80% Fan