It’s an impressive unbeaten run not without tough tests and the occasional grinding out of positive results.
And Kenny Jackett is convinced points during the remainder of the campaign will similarly be hard-earned as Pompey strive for promotion.
The second-placed Blues travel to Rochdale on Saturday for their 10th match of the League One campaign.
During their undefeated progress, there have been robust challenges provided by the likes of Luton, Bristol Rovers, Shrewsbury and Wycombe.
Nonetheless, Jackett’s gutsy side have collected 21 points from nine matches and are still to lose.
While Pompey may be among the early promotion contenders, their manager believes future fixtures will continue to be tightly fought.
Jackett said: ‘I am pleased with 21 points from nine games. Can we improve? Yes. Have we strolled it yet? No.
‘A couple of home games we have been there or thereabouts and right on top at the end, but even then there have been testing moments.
‘Most games have been very tight, ours have been, and we’ve had to work hard right until the end to get any points.
‘I think that’s the way it is going to be. I don’t know who necessarily is going to blow the league away, it doesn’t happen many times.
‘My last last time in this division with Wolves saw us pretty much third pretty until Christmas – and ended we up winning the league with record points.
‘But it wasn’t quite like that during the time.The points total and form was pretty good, but it was hard-earned.
‘I don’t expect that to be any different now.’
Pompey are presently one point off league leaders Peterborough, with Sunderland sitting in third.
And Jackett believes the table will take on a more realistic shape following Saturday’s round of League One fixtures.
He added: ‘Consistency is something I think is very subjective, in terms of what is consistent. I would suggest every team will have a spell against you.
‘Most managers will say “Judge a season on 10 games”. Well, Saturday is our 10th game.
‘It’s something managers say and quite a fair reflection. But, if after three games you have lost all three, it doesn't feel like that at all.’