Is it normal that the release build of c++/cli winform gets no optimization on speed?

I browsed through many topics suggesting using c# instead of c++/cli to create winforms. Among the reasons given, I didn't see anyone mention something about the speed so I insisted on using c++/cli for a long time.

Lately I tried a simple calculation loop to compare the speed of c++/cli and c#. It took the same time on a debug build. But the release build of the c# project got a huge optimization( 1/4 calculation time) while the c++/cli got no optimization at all. Is this normal or did I miss something?

I built the solution for C# in VS2022 Community and for c++/cli in both VS2022(.net version 4.7.2) and VS2010 Express(.net version 4.0).

I copy the code for c++/cli. The c# project did the same calculation.

#include "stdafx.h"
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <windows.h>

unsigned int    cal1(double &a1)
{
        time_t  t0 = time(0);
        SYSTEMTIME  ts0,ts1;
        GetLocalTime(&ts0);
        for(unsigned int idx1=0;idx1<0xFFFFFFFF;++idx1) a1+=0.328;
        GetLocalTime(&ts1);
        unsigned int t1 = (time(0)-t0)*1000 + ts1.wMilliseconds-ts0.wMilliseconds;
        return t1;
}

ref class Form0 : System::Windows::Forms::Form
{
public:
    
    System::Windows::Forms::Button^ bt1;
    System::Windows::Forms::Label^  lbl1;

    Form0(void)
    {
        this->SuspendLayout();
        
        this->bt1 = gcnew System::Windows::Forms::Button();
        this->bt1->Location = System::Drawing::Point(95, 18);
        this->bt1->Size = System::Drawing::Size(50, 25);
        this->bt1->Text = "button1";
        this->bt1->Click += gcnew System::EventHandler(this, &Form0::bt1_Click);
        this->Controls->Add(this->bt1);
        
        this->lbl1 = gcnew System::Windows::Forms::Label();
        this->lbl1->Location = System::Drawing::Point(72, 62);
        this->lbl1->Size = System::Drawing::Size(60, 20);
        this->Controls->Add(this->lbl1);

    }
    System::Void bt1_Click(System::Object^ sender, System::EventArgs^ e)
    {
        double a1 = 1;
        unsigned int t1;
        t1=cal1(a1);
        this->lbl1->Text = t1.ToString();
    }
};

[System::STAThreadAttribute]
int main()
{
    Form0^ F0 = gcnew Form0();
    F0->ShowDialog();
    return 0;
}