The Centurions would consider themselves a strong chance to strengthen their hold on top spot when they take on 12th-placed Gosnells this weekend.
Last Saturday, a winless Perth was always going to struggle chasing Joondalup’s formidable day-one score of 385.
But the side would not have expected to lose 20 wickets in less than 61 overs.
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READ NOWThe Centurions thrashed Perth by an innings and nearly 200 runs, the home side limping to a combined total of 190 runs on day two.
Seasoned Joondalup paceman James Boyland ripped through the Demons in the first innings to take 5-40 from an imposing nine overs.
Only middle-order batsman Sean Roberts (32) produced a 20-plus score as Joondalup skittled Perth for 103 off just 24.4 overs.
The Demons continued to worsen into their second dig, falling to 3-8 inside the first half-hour. Perth’s top four made a paltry 15 runs between them as the side crumbled for 87 from 35.5 overs.
Pace bowler Josh Anderson led bowling with 4-27 to make it 7-48 for the match.
Boyland continued to be a threat, taking 3-23 in an eight-wicket performance.