I saw 1.7 release on top of this issues list, so I tried checkout my local branch to 1.7.0, but the 2nd "ut" time after "fps" is 6 - 7 times longer than the same demo on 1.7.0 official site (https://brm.io/matter-js/demo/#stats), I can see the lagging issue when my local demo page just refreshed (when the balls start falling down).

I tried reopen browser (chrome 90.0.4430.72), re-installed whole node_modules folder, could reproduce the issue.
Below screenshot is taken from same PC side by side, left is official demo site, right side is my local demo running "dev" npm task.

Is there anything from my local webpack dev server will affect it?
Thanks for help.