CPU 100% usage and Gpu 30% usage while training model using glowtts

[UVRUser]

I have i5 with 32 cores and Rtx 3060 8gb.I use the settings below or as given in https://docs.coqui.ai/en/latest/tutorial_for_nervous_beginners.html to clone voice in English,

config = GlowTTSConfig(
batch_size=32,
eval_batch_size=16,
num_loader_workers=4,
num_eval_loader_workers=4,
run_eval=True,
test_delay_epochs=-1,
epochs=1000,
text_cleaner="phoneme_cleaners",
use_phonemes=True,
phoneme_language="en-us",
phoneme_cache_path=os.path.join(output_path, "phoneme_cache"),
print_step=25,
print_eval=False,
mixed_precision=True,
output_path=output_path,
datasets=[dataset_config],
)

I have a sample of about 7500 audio in wav format. The cpu usage is usually 100% while the average gpu usage is about 30% with maximum usage about 50% , can someone please tell me why this is happening? Any parameters I can tweak to optimized gpu usage and minimize cpu usage? Thank you.