Wpa/Wpa2 dictionary attack is very slow after the latest update

after the latest updates  (current version: 4.0.1) I saw that the brute force speed is slower than before...

Example.... 
I use hash cat utils to convert .cap to hccpax and devices available are the following:

OpenCL Platform #1: Apple
=========================
* Device #1: Intel(R) Core(TM) i7-3635QM CPU @ 2.40GHz, skipped.
* Device #2: HD Graphics 4000, 384/1536 MB allocatable, 16MCU
* Device #3: GeForce GT 650M, 256/1024 MB allocatable, 2MCU

Now... the devices speeds are very lower than before, example:

now:

Speed.Dev.#2.....:     2345 H/s (5.11ms)
Speed.Dev.#3.....:     4944 H/s (5.10ms)
Speed.Dev.#*.....:     7286 H/s

but before the update (to 4.0.1) speed was about (I don't remember precisely):

Speed.Dev.#1.....:     3500 H/s 
Speed.Dev.#2.....:     5800 H/s
Speed.Dev.#3.....:     16890 H/s

The time for a dictionary attack or brute force was increased so much.
Why now Is slower than before for no apparently reasons?
How can I resolve?

Thank you