The manager told BBC Radio 5 live: "It was an excellent performance from us today. The only thing that was disappointing was the two goals we conceded but we played some good stuff tonight and we always thought if we could move the ball quickly we could score some goals.
"The whole basis of every team I have ever been at is to make sure we have a solid base to give us something to work on.
"I think we are safe but my first game when we went to Hull we had four points so to get to 40 points is a fantastic achievement for this group of players. But we owe it to the Premier League to remain competitive until the end of the season and we want to finish the season strongly and get as many points as we can."
The result moves Palace up to 11th in the table.