Cliftonville stay one point ahead of Linfield at the top of the Irish Premiership thanks to an emphatic win in the north Belfast derby at Solitude.
Chris Curran curled in a beauty for the opening goal on 35 minutes and that was quickly followed by a second through Barry Johnston's deflected shot.
Joe Gormley lobbed Crues keeper Sean O'Neill for 3-0 right at the start of the second half.
Liam Boyce then made it four for the champions with a 52nd-minute shot.
The result effectively ended any lingering hopes Crusaders had of mounting a late title challenge.
The Crues may have the best defensive record in the division, but they have also drawn more matches than any other team, a factor which has seen them lose ground at the top end of the Premiership table.
Stephen Baxter's men are now 10 points behind Cliftonville who have won six of their last seven league games.
The Crues can have no complaints as they were clearly second best against Tommy Breslin's in-form table-toppers.
Crusaders skipper Colin Coates went close to scoring an own goal early on when his glancing header struck the inside of a post.
Cliftonville took the lead when Curran switched inside on to his left foot to send a swerving shot past keeper O'Neill.
Two minutes later skipper Johnston shot in number two and then the Reds hit the woodwork again when Gormley's header struck an upright from Eamonn Seydak's delivery.
Gormley lobbed goal number three to finish off the first move after the restart, and his strike partner Boyce quickly followed him on to the scoresheet.