diff --git a/2017-03-14/speedtest.js b/2017-03-14/speedtest.js
new file mode 100644
index 0000000..6daa556
--- /dev/null
+++ b/2017-03-14/speedtest.js
@@ -0,0 +1,207 @@
+// speedtest script for project euler exercise 87
+// can be run from cli (V8 or SpiderMonkey 45+) or browser
+
+'use strict';
+
+function isPrime(num) {
+    if (num === 3) {
+        return true;
+    }
+    
+    if (num % 2 === 0) {
+        return false;
+    }
+
+    for (let i = 3; i <= Math.sqrt(num); i++) {
+        if (num % i === 0) {
+            return false;
+        }
+    }
+    return true;
+}
+
+function mkPrimeSet(end) {
+    let primes = new Set([2,3,5,7]);
+    for(let i=10; i<Math.sqrt(end); i++) {
+        if (isPrime(i)) {
+            primes.add(i);
+        }
+    }
+    return primes;
+}
+
+function mkPrimeArray(end) {
+    let primes = [2, 3, 5, 7];
+    for (let i=10; i<Math.sqrt(end); i++) {
+        if (isPrime(i)) {
+            primes.push(i);
+        }
+    }
+    return primes;
+}
+
+function primeSet_itemOf_234(primeSet, end) {
+    let sumSet = new Set();
+    for(let item2 of primeSet) {
+        let square = item2 * item2;
+        for(let item3 of primeSet) {
+            let cube = item3 * item3 * item3;
+            for(let item4 of primeSet) {
+                let sum = square + cube + item4 * item4 * item4 * item4;
+                if (sum >= end) {
+                    break;
+                }
+                sumSet.add(sum);
+            }
+        }
+    }
+    return sumSet.size;
+}
+
+function primeSet_itemOf_432(primeSet, end) {
+    let sumSet = new Set();
+    for(let item4 of primeSet) {
+        let fourth = item4 * item4 * item4 * item4;
+        for(let item3 of primeSet) {
+            let cube = item3 * item3 * item3;
+            for(let item2 of primeSet) {
+                let sum = fourth + cube + item2 * item2;
+                if (sum >= end) {
+                    break;
+                }
+                sumSet.add(sum);
+            }
+        }
+    }
+    return sumSet.size;
+}
+
+function primeArray_index_234(primeArray, end) {
+    let sumSet = new Set();
+    for(let index2=0; index2 < primeArray.length; index2++) {
+        let square = primeArray[index2] * primeArray[index2];
+        for(let index3=0; index3 < primeArray.length; index3++) {
+            let cube = primeArray[index3] * primeArray[index3] * primeArray[index3];
+            for(let index4=0; index4 < primeArray.length; index4++) {
+                let sum = square + cube + primeArray[index4] * primeArray[index4] * primeArray[index4] * primeArray[index4];
+                if (sum >= end) {
+                    break;
+                }
+                sumSet.add(sum);
+            }
+        }
+    }
+    return sumSet.size;
+}
+
+function primeArray_index_432(primeArray, end) {
+    let sumSet = new Set();
+    for(let index4=0; index4 < primeArray.length; index4++) {
+        let fourth = primeArray[index4] * primeArray[index4] * primeArray[index4] * primeArray[index4];
+        for(let index3=0; index3 < primeArray.length; index3++) {
+            let cube = primeArray[index3] * primeArray[index3] * primeArray[index3];
+            for(let index2=0; index2 < primeArray.length; index2++) {
+                let sum = fourth + cube + primeArray[index2] * primeArray[index2];
+                if (sum >= end) {
+                    break;
+                }
+                sumSet.add(sum);
+            }
+        }
+    }
+    return sumSet.size;
+}
+
+function primeArray_itemOf_234(primeArray, end) {
+    let sumSet = new Set();
+    for(let item2 of primeArray) {
+        let square = item2 * item2;
+        for(let item3 of primeArray) {
+            let cube = item3 * item3 * item3;
+            for(let item4 of primeArray) {
+                let sum = square + cube + item4 * item4 * item4 * item4;
+                if (sum >= end) {
+                    break;
+                }
+                sumSet.add(sum);
+            }
+        }
+    }
+    return sumSet.size;
+}
+
+function primeArray_itemOf_432(primeArray, end) {
+    let sumSet = new Set();
+    for(let item4 of primeArray) {
+        let fourth = item4 * item4 * item4 * item4;
+        for(let item3 of primeArray) {
+            let cube = item3 * item3 * item3;
+            for(let item2 of primeArray) {
+                let sum = fourth + cube + item2 * item2;
+                if (sum >= end) {
+                    break;
+                }
+                sumSet.add(sum);
+            }
+        }
+    }
+    return sumSet.size;
+}
+
+function testrunFunction(fun, args, iterCount, printResult) {
+    if (!Number.isInteger(iterCount) || iterCount < 1) {
+        iterCount = 10;
+    }
+    
+    if (printResult !== true) {
+        printResult = false;
+    }
+
+    let totalTimeTaken = 0;
+    
+    for (let i = 0; i < iterCount; i++) {
+        let start = Date.now(),
+            funResult = fun(...args),
+            end = Date.now();
+        
+        if (printResult) {
+            console.log("Got result: "+funResult+" in "+String(end - start)+" ms");
+        } else {
+            console.log("Got result in "+String(end - start)+" ms");
+        }
+        totalTimeTaken += (end - start);
+    }
+
+    console.log("Average time after "+iterCount+" runs: "+totalTimeTaken/iterCount);
+}
+
+function benchmark() {
+    const MAX = 5e7;
+    const MAX_ITER = 10;
+
+    console.log("Testing prime number generation first.");
+    console.log("PrimeSet: ");
+    testrunFunction(mkPrimeSet, [MAX], MAX_ITER);
+    let primeSet = mkPrimeSet(MAX);
+    console.log("PrimeArray:");
+    testrunFunction(mkPrimeArray, [MAX], MAX_ITER);
+    let primeArray = mkPrimeArray(MAX);
+    console.log("Finished number generation tests, testing now different implementations.");
+    console.log("PrimeSet, item of, 234:");
+    testrunFunction(primeSet_itemOf_234, [primeSet, MAX], MAX_ITER, true);
+    console.log("PrimeSet, item of, 432:");
+    testrunFunction(primeSet_itemOf_432, [primeSet, MAX], MAX_ITER, true);
+    console.log("PrimeArray, index, 234:");
+    testrunFunction(primeArray_index_234, [primeArray, MAX], MAX_ITER, true);
+    console.log("PrimeArray, index, 432:");
+    testrunFunction(primeArray_index_432, [primeArray, MAX], MAX_ITER, true);
+    console.log("PrimeArray, itemOf, 234:");
+    testrunFunction(primeArray_itemOf_234, [primeArray, MAX], MAX_ITER, true);
+    console.log("PrimeArray, itemOf, 432:");
+    testrunFunction(primeArray_itemOf_432, [primeArray, MAX], MAX_ITER, true);
+}
+
+benchmark();
+/*
+undefined
+*/