is descrypt slow after ocl v1.31?

[lavisher]

I am having trouble with descrypt cracking performance. It used to be fast (v1.31) but now it is going slow for me (v1.33 or v1.35). Benchmarks reveal the same numbers for each version and so do short runs but once I get a big enough dictionary, everything falls apart. It was suggested to me to try piping (shown below) but that didn't fix the problem.

Detailed below, both releases were freshly un-7zr'd immediately prior to testing. I use the same rules, same dictionary and same test hashes in both tests. The only thing that changes is the cuda version. The same problem occurs with 1.35.

I will be grateful for any help.

Here is the output:

lavisher@crackhost:~/test/cudaHashcat-1.31$ ../hashcat-0.49/hashcat-cli64.bin --stdout dictionary.txt -r ~/audit/2015-02-12.rules | ./cudaHashcat64.bin --hash-type 1500 -o output.txt ~/audit/hashes.crypt

[...snip...]

Session.Name...: cudaHashcat
Status.........: Exhausted
Input.Mode.....: Pipe
Hash.Target....: File (/home/lavisher/audit/hashes.crypt)
Hash.Type......: descrypt, DES(Unix), Traditional DES
Time.Started...: Wed Apr 15 16:30:58 2015 (2 hours, 12 mins)
Speed.GPU.#1...: 118.9 kH/s
Recovered......: 403/1527 (26.39%) Digests, 66/607 (10.87%) Salts
Progress.......: 2979221737493
Skipped........: 48207862800
Rejected.......: 2457490450973
HWMon.GPU.#1...: -1% Util, 56c Temp, 62% Fan

Started: Wed Apr 15 16:30:58 2015
Stopped: Wed Apr 15 18:43:44 2015

lavisher@crackhost:~/test/cudaHashcat-1.31$ cd ../cudaHashcat-1.33/
lavisher@crackhost:~/test/cudaHashcat-1.33$ ../hashcat-0.49/hashcat-cli64.bin --stdout dictionary.txt -r ~/audit/2015-02-12.rules | ./cudaHashcat64.bin --hash-type 1500 -o output.txt ~/audit/hashes.crypt

[...snip...]

Session.Name...: cudaHashcat
Status.........: Running
Input.Mode.....: Pipe
Hash.Target....: File (/home/lavisher/audit/hashes.crypt)
Hash.Type......: descrypt, DES(Unix), Traditional DES
Time.Started...: Wed Apr 15 19:24:34 2015 (14 hours, 1 min)
Speed.GPU.#1...: 67783 H/s
Recovered......: 404/1527 (26.46%) Digests, 66/607 (10.87%) Salts
Progress.......: 2820735306730
Skipped........: 46255920641
Rejected.......: 2320884538284
HWMon.GPU.#1...: -1% Util, 43c Temp, 45% Fan

[snip - SESSION NOT COMPLETE]