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Host A:
Generated in 0.0626788 seconds (95.66% PHP / 4.34% MySQL)

Host B:
Generated in 0.1476531 seconds (44.44% PHP / 55.56% MySQL)

If the server load is reasonably low on both hosts, does the high MySQL % on host 'B' indicate their db system probably isn't setup properly?

Thank you very much for helping.

Just depends on the server specs / setup / # of users accessing it currently.

Yup it's something that you should take up with your host.