diff --git a/draftlogs/7301_fix.md b/draftlogs/7301_fix.md
new file mode 100644
index 00000000000..a98abe40f66
--- /dev/null
+++ b/draftlogs/7301_fix.md
@@ -0,0 +1,2 @@
+- Performance improvement for scattergl traces with many points [[#7301](https://github.com/plotly/plotly.js/pull/7301)],
+ with thanks to @giuseppe-straziota for the contribution!
\ No newline at end of file
diff --git a/src/components/fx/helpers.js b/src/components/fx/helpers.js
index f11e5266ef7..8ba0d2fa254 100644
--- a/src/components/fx/helpers.js
+++ b/src/components/fx/helpers.js
@@ -60,8 +60,13 @@ exports.getClosest = function(cd, distfn, pointData) {
// this is the longest loop... if this bogs down, we may need
// to create pre-sorted data (by x or y), not sure how to
// do this for 'closest'
- for(var i = 0; i < cd.length; i++) {
- var newDistance = distfn(cd[i]);
+
+ // defined outside the for to improve the garbage collector performance
+ var newDistance = Infinity;
+ // the browser engine typically optimizes the length, but it is outside the cycle if it does not
+ var len = cd.length
+ for(var i = 0; i < len; i++) {
+ newDistance = distfn(cd[i]);
if(newDistance <= pointData.distance) {
pointData.index = i;
pointData.distance = newDistance;
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