I'm not too sure, I think Perez took too much out of his tyres in the first few laps to try to gap LeClerc, once the Ferrari was out then all the pressure was off, the pass from Verstappen was based on race pace although made easier by the instructions. From that point they both went into conserve the engine mode, there was no threat so why stress anything, I'm sure if the Ferrari's had still been on the track then Perez would have driven completely different.
Let's remember not since Ricciardo has anyone been able to get within 0.5 seconds of Verstappen & now we see Perez beating him in a straight fight, so much so Daddy Verstappen is throwing his dummy out trying to protect his precious baby.
I was disappointed in Norris, he came over as a petulant teenager wanting Riccardo to move over just so he finished ahead of him although Ricciardo had played the team game earlier & effectively screwed his race up.