How to minimize the complexity of this code ,by avoiding it to traverse all the jenkins job(lets say 5000 jobs?) - jenkins

Question

I'm changing my jenkins job's SCM url from, lets say gitlab to github by using Groovy script. Is there any way to minimize the complexity of this code ?
I have used Jenkins.instance.items.each {} which traverses through all the jobs in my jenkins
import hudson.plugins.git.*
import jenkins.*
import jenkins.model.*
def modifyGitUrl(url) {
def newurl = url.replace("source", "destination")
return newurl
}
def modifyGitID(credentialsId) {
def newID = ("Jenkins User ID")
return newID
}
Jenkins.instance.items.each {
if(it.name == "expected name"){
if (it.scm instanceof GitSCM) {
def oldScm = it.scm
def newUserRemoteConfigs = oldScm.userRemoteConfigs.collect {
new UserRemoteConfig(modifyGitUrl(it.url), it.name, it.refspec, modifyGitID(it.credentialsId))
}
def newScm = new GitSCM(newUserRemoteConfigs, oldScm.branches, oldScm.doGenerateSubmoduleConfigurations,
oldScm.submoduleCfg, oldScm.browser, oldScm.gitTool, oldScm.extensions)
it.scm = newScm
it.save()
}
}
}