diff --git a/.github/workflows/create-comment-perf.yml b/.github/workflows/create-comment-perf.yml
index 3f3dfe902c..03dd021e14 100644
--- a/.github/workflows/create-comment-perf.yml
+++ b/.github/workflows/create-comment-perf.yml
@@ -42,13 +42,34 @@ jobs:
         uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
+          # Taken from https://github.com/actions/github-script/blob/main/.github/workflows/pull-request-test.yml
           script: |
             var fs = require('fs');
             var issue_number = Number(fs.readFileSync('./NR'));
             var comment_body = fs.readFileSync('./COMMENT');
-            await github.rest.issues.createComment({
+
+            // Get the existing comments.
+            const {data: comments} = await github.rest.issues.listComments({
               owner: context.repo.owner,
               repo: context.repo.repo,
               issue_number: issue_number,
-              body: comment_body.toString('utf8')
             });
+
+            // Find any comment already made by the bot.
+            const botComment = comments.find(comment => comment.user.id === 41898282 && comment.body.includes('# Perf diff from master'));
+
+            if (botComment) {
+              await github.rest.issues.updateComment({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  comment_id: botComment.id,
+                  body: comment_body.toString('utf8')
+              });
+            } else {
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: issue_number,
+                body: comment_body.toString('utf8')
+              });
+            }