CPU utilization

[KhArtNJava]

I am comparing CPU utilization of
pocketsphinx_continuous -hmm zero_ru.cd_cont_4000 -dict vocabular.dict -jsgf calc.jsgf -inmic yes
and of Python script

speech = LiveSpeech(
    verbose=True,
    hmm='c:/Projects/pocketsphinx-5prealpha-win32/pocketsphinx/bin/Release/x64/zero_ru.cd_cont_4000',
    lm=False,
    jsgf='c:/Projects/pocketsphinx-5prealpha-win32/pocketsphinx/bin/Release/x64/calc.jsgf',
    dic='c:/Projects/pocketsphinx-5prealpha-win32/pocketsphinx/bin/Release/x64/vocabular.dict',
    allphone_ci=False,
    vad_threshold=2.0,
    kws_threshold=1.0,
    cmn='current',

    sampling_rate=16000,
    buffer_size=2048,
    no_search=False,
    full_utt=False,

)

A pocketsphinx_continuous process uses from 1% to 5% of one core of my Core i3 CPU.
Python script uses 100% of one core of CPU.

Why pocketsphinx-python uses a lot of CPU resources? How to reduce CPU utilization of the script?