cBots loading other Symbols' Bars causes CPU in usage even nothing run OnTick() ?

Hello, 

I have the below code which my cBots need to load other symbols' data OnStart(), and no lines OnTick(). However...

I found my CPU is in steady high (not bursting) usage when I launched 2 cBots in different charts, even when the market is closed. After taking out other lines of the codes, I found that loading other symbols data might be the reason. See below 2 screen chops of comparison. (My CPU is a bit old i7 7th generation, but not the reason causing the issue.)

Can you confirm my guess, and advise any optimising method to reduce CPU usage?

Thanks in advance.

P.S. the test is in TimeFrame.Minute

using System;
using cAlgo.API;
using cAlgo.API.Internals;

namespace cAlgo.Robots
{
    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class TestGroupA : Robot
    {
        [Parameter("Reset Date",    DefaultValue = "2022-05-06",    Group = "Alignment"     )] public string ResetDate  { get; set; }
        [Parameter("Reset Time",    DefaultValue = "04:29:00",      Group = "Alignment"     )] public string ResetTime  { get; set; }

        //Bars to load for Calculate 
        private Bars EURUSD, EURGBP, EURAUD, EURNZD, EURCAD, EURCHF, EURJPY;        
        private Bars GBPUSD,         GBPAUD, GBPNZD, GBPCAD, GBPCHF, GBPJPY;
        private Bars AUDUSD,                 AUDNZD, AUDCAD, AUDCHF, AUDJPY;
        private Bars NZDUSD,                         NZDCAD, NZDCHF, NZDJPY;
        private Bars USDCAD,                                 CADCHF, CADJPY;
        private Bars USDCHF,                                         CHFJPY;
        private Bars USDJPY;

        //Index at OpenTime of LastBar of EachSymbol;
        private int in_EURUSD, in_EURGBP, in_EURAUD, in_EURNZD, in_EURCAD, in_EURCHF, in_EURJPY;
        private int in_GBPUSD,            in_GBPAUD, in_GBPNZD, in_GBPCAD, in_GBPCHF, in_GBPJPY;
        private int in_AUDUSD,                       in_AUDNZD, in_AUDCAD, in_AUDCHF, in_AUDJPY;
        private int in_NZDUSD,                                  in_NZDCAD, in_NZDCHF, in_NZDJPY;
        private int in_USDCAD,                                             in_CADCHF, in_CADJPY;
        private int in_USDCHF,                                                        in_CHFJPY;
        private int in_USDJPY;


        protected override void OnStart()
        {
        //1.GetBars for EachSymbol 
            EURUSD = MarketData.GetBars(Bars.TimeFrame, "EURUSD");  GBPUSD = MarketData.GetBars(Bars.TimeFrame, "GBPUSD");  AUDUSD = MarketData.GetBars(Bars.TimeFrame, "AUDUSD");  NZDUSD = MarketData.GetBars(Bars.TimeFrame, "NZDUSD");
            EURGBP = MarketData.GetBars(Bars.TimeFrame, "EURGBP");  GBPAUD = MarketData.GetBars(Bars.TimeFrame, "GBPAUD");  AUDNZD = MarketData.GetBars(Bars.TimeFrame, "AUDNZD");  NZDCAD = MarketData.GetBars(Bars.TimeFrame, "NZDCAD");
            EURAUD = MarketData.GetBars(Bars.TimeFrame, "EURAUD");  GBPNZD = MarketData.GetBars(Bars.TimeFrame, "GBPNZD");  AUDCAD = MarketData.GetBars(Bars.TimeFrame, "AUDCAD");  NZDCHF = MarketData.GetBars(Bars.TimeFrame, "NZDCHF");
            EURNZD = MarketData.GetBars(Bars.TimeFrame, "EURNZD");  GBPCAD = MarketData.GetBars(Bars.TimeFrame, "GBPCAD");  AUDCHF = MarketData.GetBars(Bars.TimeFrame, "AUDCHF");  NZDJPY = MarketData.GetBars(Bars.TimeFrame, "NZDJPY");
            EURCAD = MarketData.GetBars(Bars.TimeFrame, "EURCAD");  GBPCHF = MarketData.GetBars(Bars.TimeFrame, "GBPCHF");  AUDJPY = MarketData.GetBars(Bars.TimeFrame, "AUDJPY");  
            EURCHF = MarketData.GetBars(Bars.TimeFrame, "EURCHF");  GBPJPY = MarketData.GetBars(Bars.TimeFrame, "GBPJPY");                                                          USDCAD = MarketData.GetBars(Bars.TimeFrame, "USDCAD");
            EURJPY = MarketData.GetBars(Bars.TimeFrame, "EURJPY");                                                          USDCHF = MarketData.GetBars(Bars.TimeFrame, "USDCHF");  CADCHF = MarketData.GetBars(Bars.TimeFrame, "CADCHF");
                                                                    USDJPY = MarketData.GetBars(Bars.TimeFrame, "USDJPY");  CHFJPY = MarketData.GetBars(Bars.TimeFrame, "CHFJPY");  CADJPY = MarketData.GetBars(Bars.TimeFrame, "CADJPY");

        //2.Get Index# for EachSymbol at Reset-DateTime 
            DateTime dateTime = DateTime.Parse(ResetDate + " " + ResetTime).Add(-Application.UserTimeOffset); //Convert to ServerTime

            in_EURUSD = EURUSD.OpenTimes.GetIndexByTime(dateTime);  in_GBPUSD = GBPUSD.OpenTimes.GetIndexByTime(dateTime);  in_AUDUSD = AUDUSD.OpenTimes.GetIndexByTime(dateTime);  in_NZDUSD = NZDUSD.OpenTimes.GetIndexByTime(dateTime);
            in_EURGBP = EURGBP.OpenTimes.GetIndexByTime(dateTime);  in_GBPAUD = GBPAUD.OpenTimes.GetIndexByTime(dateTime);  in_AUDCAD = AUDCAD.OpenTimes.GetIndexByTime(dateTime);  in_NZDCAD = NZDCAD.OpenTimes.GetIndexByTime(dateTime);
            in_EURAUD = EURAUD.OpenTimes.GetIndexByTime(dateTime);  in_GBPCAD = GBPCAD.OpenTimes.GetIndexByTime(dateTime);  in_AUDNZD = AUDNZD.OpenTimes.GetIndexByTime(dateTime);  in_NZDCHF = NZDCHF.OpenTimes.GetIndexByTime(dateTime);
            in_EURCAD = EURCAD.OpenTimes.GetIndexByTime(dateTime);  in_GBPNZD = GBPNZD.OpenTimes.GetIndexByTime(dateTime);  in_AUDCHF = AUDCHF.OpenTimes.GetIndexByTime(dateTime);  in_NZDJPY = NZDJPY.OpenTimes.GetIndexByTime(dateTime);
            in_EURNZD = EURNZD.OpenTimes.GetIndexByTime(dateTime);  in_GBPCHF = GBPCHF.OpenTimes.GetIndexByTime(dateTime);  in_AUDJPY = AUDJPY.OpenTimes.GetIndexByTime(dateTime);
            in_EURCHF = EURCHF.OpenTimes.GetIndexByTime(dateTime);  in_GBPJPY = GBPJPY.OpenTimes.GetIndexByTime(dateTime);                                                          in_USDCAD = USDCAD.OpenTimes.GetIndexByTime(dateTime);
            in_EURJPY = EURJPY.OpenTimes.GetIndexByTime(dateTime);                                                          in_USDCHF = USDCHF.OpenTimes.GetIndexByTime(dateTime);  in_CADCHF = CADCHF.OpenTimes.GetIndexByTime(dateTime);
                                                                    in_USDJPY = USDJPY.OpenTimes.GetIndexByTime(dateTime);  in_CHFJPY = CHFJPY.OpenTimes.GetIndexByTime(dateTime);  in_CADJPY = CADJPY.OpenTimes.GetIndexByTime(dateTime);

        //Debugging:
            string msg  = string.Format("At the Reset-DateTime: {0}", dateTime.Add(Application.UserTimeOffset).ToString("yyyy-MM-dd HH:mm:ss"));
            msg += string.Format("\nEURUSD's Index#: {0}", in_EURUSD);
            msg += string.Format("\nGBPUSD's Index#: {0}", in_GBPUSD);
            msg += string.Format("\n\nCPU is 12% used, even no calculation OnTick()...?");
            Chart.DrawStaticText("msg", msg, VerticalAlignment.Bottom, HorizontalAlignment.Center, Color.Aquamarine);
        //Debugging END

        }

        protected override void OnTick()
        {

        }

        protected override void OnStop()
        {

        }

    }

}