WP Smush Pro went slowly

Dear Support.

The smush process start very well, but the last 24 hours it goes very slowly. The last 4 hours it only smush 4 images and that´s very slowly compare with the beginning.

The most images uploaded is around 1900x1200 px and already optimized, but your plugin save some space, so it there a way to get around that the process speed is very slow now (no errors at the moment)?

Earlier there was some server 500 errors, but this I fix with the hosting.

Thank you very much.

Best regards,