Europe is the highest personal tax region in the world, Latin America is the lowest. Aside from countries where taxation is unknown, Bulgaria boasts the lowest rate within the EU. A flat tax of 10% was recently introduced to replace the previous 24% rate. In the Asia-Pacific region, Hong Kong's 16% is the lowest tax rate, while Paraguay is at the bottom in Latin America with its 10% rate.
I would get professional advice as even if you are non resident, you can still be taxed on Irish source income. The savings from such advice should far outweigh the cost.