ROBINS manager Darren Ryan saw his side register their first home win of the season, but was left frustrated by a below par second-half showing.
A first half brace from Mark Lloyd Williams, taking his tally to four goals from three outings, helped set up victory with Kevin Scott and Richard Williams Cooke adding goals inside the first 36 minutes.
But injury-hit Porthmadog, still searching for their first points, came back with second-half replies from Rhys Roberts and Paul Roberts.
"When you're 4-0 up you should go out and enjoy the second half but instead we became sloppy and took our foot off the gas," admitted Ryan.
The Robins took a grip of the encounter to lead 4-0 at the break, with the predatory Lloyd Williams pouncing for an early opener after a Colin Loss strike had rebounded into his path.
Debutant keeper Joe Sagar was then beaten a second time on 15 minutes when Scott found the net with a quickly taken free kick.
A third followed just three minutes later when Lloyd Williams headed home and Williams Cooke fired a fourth on 36 minutes.
Newtown failed to push on in the second period as Porthmadog became a greater force.
Rhys Roberts pulled one back on 67 minutes following a corner and Paul Roberts reduced the arrears further before Lloyd Williams hit a post with a firm header.