You're going to need to provide a lot more information to help us debug.
At the minimum you need to provide
How many documents are in the enrich / lookup index?
How many documents are in the source index that gets enriched.
Are you running the entire source index through the enriched processor every time?
What is your enrich policy?
What are the mappings for these different indexes?
And of course any performance issue could have to do with the actual architecture of your cluster.
How many nodes? What kind of hardware is it running on?
So many questions before we can even attempt to give you an answer.
So the more detail you provide the better chance we have to help.
Oh yes, and as the automated message, you're on an extremely old version, which of course has been many performance enhancements between that version and the latest version, even if you updated the 717. You would be doing much better.
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