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MeteorJS high response time on Heroku

I am running a Meteor app on Heroku and the Heroku response time chart is constantly filled with high response time queries hitting 30 seconds limit

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The router logs shows that all the 30 seconds queries are some kind of sockJS xhr call

14 Aug 2021 11:37:33.249334 <158>1 2021-08-14T03:37:32.837295+00:00 heroku router - - at=info method=POST path="/sockjs/950/pwiv10fk/xhr" host=www.abc.com request_id=edbe326a-cddd-4e5e-9347-0f5c1c49651b fwd="121.6.80.103,162.158.165.53" dyno=web.1 connect=0ms service=29493ms status=200 bytes=384 protocol=httpHigh Response Time
14 Aug 2021 11:37:33.358335 <158>1 2021-08-14T03:37:32.837093+00:00 heroku router - - at=info method=POST path="/sockjs/707/7haw05h4/xhr" host=www.abc.com request_id=20ca52a2-5aa4-43fa-bb61-39462eb0ab86 fwd="121.6.80.103,162.158.167.169" dyno=web.1 connect=0ms service=29484ms status=200 bytes=384 protocol=httpHigh Response Time
14 Aug 2021 11:38:03.405335 <158>1 2021-08-14T03:38:02.836998+00:00 heroku router - - at=info method=POST path="/sockjs/950/pwiv10fk/xhr" host=www.abc.com request_id=f3a51bc3-9319-4b80-91b5-ed76bf179493 fwd="121.6.80.103,162.158.166.136" dyno=web.1 connect=0ms service=29480ms status=200 bytes=384 protocol=httpHigh Response Time

The reality is that there is only a few users on the app, and no unusual activity happening on server. Actually the users did not experience slow down as well, so i suspect, the socket connections mechanisms on Meteor app is polluting the heroku response time charts, I also have to turn off slow response time alerts because they are too many.

These non-stops 30 seconds response times calls creates a problem which I do not really know the true speed of the web app.

What is happening and how to avoid this?

Solution

  • It seems that the issue was introduced by Cloudflare. They seem to have been interrupting the websocket connections, causing Meteor to fall back to polling, which is not efficient.