Xslt 2.0 to remove duplicates in oic

Summary:

What is the fastest possible way to use in xslt 2.0 in oic gen 3 to remove the duplicates from the file size of 17 MB? I have used for-each-group function to remove duplicates . It works fine for smaller files. But xslt times out in 2 mins for bigger file size.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):