script.js

const throttleFunction=(func, delay)=>{
  let prev = 0;
  return (...args) => {
    let now = new Date().getTime();
    if(now - prev> delay){
      prev = now;
      return func(...args); 
    }
  }
}
document.querySelector("#center")
.addEventListener("mousemove", throttleFunction((dets)=>{
  //your less repetation code
  var div = document.createElement("div");
    div.classList.add('imagediv');
    div.style.left = dets.clientX+'px';
    div.style.top = dets.clientY+'px';

    var img = document.createElement("img");
    img.setAttribute("src", "https://images.unsplash.com/photo-1682686580433-2af05ee670ad?ixlib=rb-4.0.3&ixid=M3wxMjA3fDF8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1374&q=80")
    div.appendChild(img);

    document.body.appendChild(div);
    
    gsap.to(img,{
        y:"0",
        ease:Power1,
        duration: .6
    })
    gsap.to(img,{
        y:"100%",
        delay:.6,
        ease:Power2
    })

    setTimeout(function(){
        div.remove();
    }, 1000)
}, 400));