Explanation on data upload process

Hi

I imported 465 triples into my graph database using Neosemantics app. It took 210ms to complete the job.
I then imported 945 triples into the same graph database and it took 78ms.
My understanding was as number of triples increase the time taken to upload increases. The example shows I am wrong.
Can anyone explain me how does upload process works?

Thanks
Shilpa

Have you written ETL procedures for loading data...
Many thanks
Mr Sameer Sudhir G

Yes, I converted the csv file into rdf format and uploaded them.