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That impressive figure saw the South Coast club set a new League Two attendance record, but the majority of those supporters went home disappointed.
That dejection was only heightened by the fact that Pompey had started the match very brightly.
The ex-Peterborough midfielder ran almost the entire length of the pitch before squaring to Smalley, who took a neat first touch and finished well from 10 yards.
Potter was on the scoresheet himself four minutes later, as he smashed Sean Rigg's low cross into the net from close range.
The task was then made almost impossible on 64 minutes, as man-of-the-match Potter bagged his second goal of the game with an impressive solo effort.
Smalley scored his second to complete the rout with 18 minutes remaining, tapping in from close range following more good work from Potter.