This answer is old but it may help you. I see that you work with keywords but your query does not use any filter. As the answer below says, it's complicated to give performance advice but maybe following some tips there you can achieve your goal.
This answer is old but it may help you. I see that you work with keywords but your query does not use any filter. As the answer below says, it's complicated to give performance advice but maybe following some tips there you can achieve your goal.
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