console.log("Start = " + Game.cpu.getUsed());
..
console.log("T = " + Game.cpu.getUsed());
..
console.log("Var = " + Game.cpu.getUsed());

I expect next log

Start = ????
Var = ????
T = ????
.. and repeat
Start = ????
Var = ????
T = ????

But i revived next Logs, why "T" was display without "Start" and "Var" after some cycles

[4:02:53 PM] [shard1]Start = 0.295728
[4:02:53 PM] [shard1]Var = 2.758834
[4:02:53 PM] [shard1]T = 9.199415
[4:02:55 PM] [shard1]wall repair time! walls.length = 0
[4:02:55 PM] [shard1]nothing damaged enough to repair
[4:02:55 PM] [shard1] E = 504/800 Lo = 3/3 HR = 1 UP = 3 BU = 4 DD = 0
[4:02:57 PM] [shard1]Start = 0.19143
[4:02:57 PM] [shard1]Var = 2.036277
[4:02:57 PM] [shard1]T = 7.996323
[4:02:59 PM] [shard1]T = 5.138256999999999
[4:03:01 PM] [shard1]T = 4.808282999999999
[4:03:03 PM] [shard1]T = 5.401028999999999
[4:03:05 PM] [shard1]T = 5.394404
[4:03:07 PM] [shard1]T = 4.252630999999999 

Code

console.log("Start = " + Game.cpu.getUsed());
require('prototype.spawn')();
var roleHarvester = require('role.harvester');
var roleUpgrader = require('role.upgrader');
var roleBuilder = require('role.builder');
var roleDamager = require('role.damager');
var roleTower = require('role.tower');
var roleWarlord = require('role.warlord');
var roleMiner = require('role.miner');
var roleLogist = require('role.logist');
// setup some minimum numbers for different roles
var minimumNumberOfHarvesters = 1;
var minimumNumberOfMiners = 2;
var minimumNumberOfLogists = 3;
var minimumNumberOfUpgraders = 3;
var minimumNumberOfBuilders = 4;
var minimumNumberOfRepairers = 0;
var minimumNumberOfWallRepairers = 0;
var minimumNumberOfDamagers = 0;
var minimumNumberOfHealers = 0;
var minimumNumberOfWarlords = 0;

var HOME = 'W38N28';
var TargetIndex = 'W39N29';

console.log("Var = " + Game.cpu.getUsed());

module.exports.loop = function () {
    // check for memory entries of died creeps by iterating over Memory.creeps
    for (let name in Memory.creeps) {
        // and checking if the creep is still alive
        if (Game.creeps[name] == undefined) {
            // if not, delete the memory entry
            delete Memory.creeps[name];
        }
    }
    // for every creep name in Game.creeps
    for (let name in Game.creeps) {
        // get the creep object
        var creep = Game.creeps[name];

        // if creep is harvester, call harvester script
        if (creep.memory.role == 'harvester') {
            roleHarvester.run(creep);
        }

        // if warlminer call miner
        else if (creep.memory.role == 'miner') {
            roleMiner.run(creep);
        }
        // if warlminer call miner
        else if (creep.memory.role == 'logist') {
            roleLogist.run(creep);
        }

        // if creep is builder, call builder script
        else if (creep.memory.role == 'builder') {
            roleBuilder.run(creep);
        }
        // if creep is repairer, call repairer script
        else if (creep.memory.role == 'repairer') {
            roleRepairer.run(creep);
        }
        // if creep is wallRepairer, call wallRepairer script
        else if (creep.memory.role == 'wallRepairer') {
            roleWallRepairer.run(creep);
        }
        // if creep is longDistanceHarvester, call longDistanceHarvester script
        else if (creep.memory.role == ('longDistanceHarvester')) {
            roleLongDistanceHarvester.run(creep);
        }
        

        else if (creep.memory.role == 'damager') {
//            creep.say('hi');
            roleDamager.run(creep);
        }
        // if warlord
        else if (creep.memory.role == 'warlord') {
            roleWarlord.run(creep);
        }
        
         // if creep is upgrader, call upgrader script
        else if (creep.memory.role == 'upgrader') {
            roleUpgrader.run(creep);
        }
        
        // if creep is upgrader, call upgrader script
        else if (creep.memory.role == 'healer') {
            roleHealer.run(creep);
        }
        
    }
    
console.log("T = " + Game.cpu.getUsed());    

You'll want to move any "run every tick" to inside the main loop. In this case move your console.log statements. The require statements should stay outside the loop because they only need to load once.

// This code runs only one time, when you push new code 
// or a reset happens on the server.
module.exports.loop = function () {
    // This code runs every tick
}