Mr. Perez - I assume he started on soft tyres.
He ran a good 3 seconds off the pace on his first stint (1:35 vs 1:32 Vettel early on, and right before his stop 1:34 vs 1:31 of the leaders).
Then, Lap 24 he pits and takes hard tyres.
Within 4 laps, he's into the 1:31s, gets into the 1:30s for a good part of his 2nd stint and remains in the 1:31s all through the end, for a whopping 34 laps!
He even got a 1:29 at some point, briefly the fastest lap of the race.
I guess that's a pretty awesome feat!
If only his first stint would have been better...