Problem 12: Highly divisible triangular number

JavaScript
#1

Tell us what’s happening:
So my code below works for the first 3 test-cases but seems to time-out for the large n-values. How might I go about improving the performance of my code so it doesn’t time-out?

Your code so far


function divisibleTriangleNumber(n) {

  function triCalc(x){
    return (x*(x+1))/2
  }

  function calcDivs(num){
    let divCount = 0 
      for (let j = 1; j <= num; j++){
          if (num%j===0){
            divCount++
          }
      }
      return divCount
  }

  let i = 1
  let triVal, totalDivs;

  while (totalDivs <= n){
    triVal = triCalc(i)
      totalDivs = calcDivs(triVal)
    i++
  }

  return triVal 
}

divisibleTriangleNumber(500);

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Link to the challenge:
https://learn.freecodecamp.org/coding-interview-prep/project-euler/problem-12-highly-divisible-triangular-number/

#2