Scott Brown led the route of St Mirren as Celtic carved out a dozen scoring chances for the second week running.
At Motherwell last week the hoops survived a late scare when Lee Erwin headed wide in front of goal in the closing stages with the St Mirren threat coming in the early stages.
Sean Kelly scored against an exposed Celtic defence but by the 20th minute the hoops were 3-1 up with James Forrest scoring either side of a double from Brown.
Frustrations got the better of John Guidetti as he booted the post after a point blank save from the St Mirren keeper with the on-loan striker taken off injured early in the second half.
Stefan Scepovic almost scored with a brilliant first shot then missed two chances he ought to have scored with before hitting woodwork late in the match from a tight angle.
There will be plenty for Ronny Deila and his backroom team to examine when they get their teeth into the dvd’s this week with the hoops boss pleased with the chances his side are creating.
“There were a lot of pleasing things but again I was thinking ‘is this enough? Should we be scoring more goals,” the Celtic boss asked.
“We are creating chances and that is positive. Also some of the attacks are the way I want to attack, with opposite movements and three players involved.
“There were some good attacks and we are playing more forward now as well. There is also a quick reaction to winning the ball back.
“That’s something we have to work on if we are going to improve – we need to be more clinical. It’s hard sitting here and being critical when you’re winning 4-1 and could have scored 10, but again that shows the potential in the team.”