I can confirm this, as I am toying with an endless sidescroller, and the jank is horrible with 115, in c2 and c3 runtime, with or without worker, any scrolling background janks like crazy, it was not brilliant before, but this is horrible.
I'm probably going to ditch this project, if there are no improvements.
If anyone needs to see it, just download endless runner template, and set the platform plugin to disabled, sit back and watch.
BTW, I'm a great advocate for the construct software, but sometimes things just have to be said.