Longer time generating embeddings on GPU than CPU

[erpayo]

Hi, when generating embeddings for chunks, CPU takes longer than GPU:

On CPU:
CPU times: user 6min 12s, sys: 3min 52s, total: 10min 4s
Wall time: 1min 43s

On GPU:
CPU times: user 3min 10s, sys: 9.06 s, total: 3min 19s
Wall time: 3min 18s

Note: I'm running it on a Mac with M1 Pro using "mps" device for GPU instead of "cuda" device. Also, I changed the embedding model to multilingual version of the same model: sentence-transformers/paraphrase-multilingual-mpnet-base-v2

In the example, with a RTX4090 GPU times are 1/10 of CPU times... why is my GPU taking almost double time than CPU?