It was not third time’s the charm for Freddy Peralta.  The Mets pitcher faltered toward the end of his night Friday against the Rockies as he lost his third consecutive start and continued to struggle with his longevity.  Peralta pitched a scoreless four innings before surrendering control, as he allowed an RBI on a fielder’s choice in the fifth before giving up a go-ahead double from Jake McCarthy the following inning in the Mets’ 4-3 loss .  The righty had managed to get off relatively scot-free after loading the bases in the fifth but was pulled shortly after McCarthy’s RBI put runners on second and third.  He finished his night with eight strikeouts against seven hits in 5 ²/₃ innings, and acknowledged he’s putting “pressure on myself” to finish starts off.  “Mentally, I have to allow myself to keep trusting in the process.…