The Westmeath woman says it's not as simple as slapping fines on corporations every so often.
The Data Protection Commissioner says some critics who complain her team moves too slowly "understand very little" about investigations.
Athlone's Helen Dixon was speaking at the Bloomberg Business conference, which is taking place in Powerscourt, County Wicklow.
GDPR, which is an EU law, came into force in 2018 - and indirectly made Ireland's Commission the lead big tech supervisor in the EU.
Commissioner Dixon says it's not as simple as slapping fines on corporations every so often:
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