Importing Very Very Slow

I have Suite CRM version 7.10.X I have created a custom module (similar) to contacts, when i trying to import data via CSV file the import speed is very very slow. It take almost 15 mins for 100 records, can some please help me fix this.

Do you have any workflow or logic hook? that might be executing after/before save?

No we do not have any Logic hook or Work flow defined for this module, Still it is very slow.

Can someone please suggest on any setting we need to make to make the importing faster as we are still facing the same problem ?

Which type of problem, may I know that.

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