We have seen customers have issues with loading in bulk lists of values (account numbers, emails, etc) within the Matching Customer/Member Identifier report. This is caused by browser extensions such as Grammarly that are attempting to check all of the values as they are pasted in. Disabling the browser extension should solve this problem as it is not related to Core iQ.
Why does it take so long to load a list of values into the Matching Identifier Report?
Onovative Support