Какой из вариантов перебора массива быстрее?

ip148.ip-54-39-138.net;3128;
hotspot.rhitcr.com;8080;
h2830068.stratoserver.net;3128;
free-http1.awesomeproxy.io;3128;
fo211.i10.mi.ru;3128;
filter.maconk12.org;3128;
elearn2-pc2.germanistik.uni-kassel.de;3128;
ec2-52-54-174-211.compute-1.amazonaws.com;8080;
ec2-52-51-155-249.eu-west-1.compute.amazonaws.com;8080;
ec2-52-39-155-119.us-west-2.compute.amazonaws.com;80;
ec2-52-14-238-243.us-east-2.compute.amazonaws.com;3128;
ec2-35-170-71-181.compute-1.amazonaws.com;8080;
ec2-35-164-212-102.us-west-2.compute.amazonaws.com;4000;
ec2-35-158-101-150.eu-central-1.compute.amazonaws.com;80;
ec2-34-221-62-166.us-west-2.compute.amazonaws.com;80;
ec2-34-211-41-52.us-west-2.compute.amazonaws.com;3128;
ec2-34-203-218-129.compute-1.amazonaws.com;3128;
ec2-3-17-23-70.us-east-2.compute.amazonaws.com;3128;
ec2-18-228-14-44.sa-east-1.compute.amazonaws.com;3128;
ec2-18-222-182-77.us-east-2.compute.amazonaws.com;3128;
ec2-18-209-92-6.compute-1.amazonaws.com;8080;
ec2-18-191-242-72.us-east-2.compute.amazonaws.com;3128;
ec2-13-57-253-214.us-west-1.compute.amazonaws.com;8080;
EARTROLY.com;3128;
csiserver.ucd.ie;3128;
cp.sydo.it;80;
cm-84.209.61.144.getinternet.no;3128;
cm-84.209.138.191.getinternet.no;3128;
c738.cloud.wiroos.net;3128;
bikulciute.lt;3128;

if (preg_match("![a-z]!",$str[0]))
     {
       $str[0] = str_replace("static.","",$str[0]);
       $proxy = preg_replace("!\.?[a-zA-Z\.-0-9]+$!","",$str[0]);
       $str[0] = str_replace("-",".",$proxy);
     }