I dropped XWalk in April 2017 and fortunately I kind of let a trace of it. If you are interested see following post Crosswalk alternatives
I have to say I’m still very happy to have done that. App is still smooth, boot time is the same (I mean since then better but when I removed XWalk same same) and cherry on the cake, app bundle is super smaller. But like I said, most of the devices of my markets are up-to-date, juste checked, only 17% are using Android 6, the rest of them is above Android 7.0
I’m really super surprised that you noticed differences on your Pixel Phone. Which version of Android is running on this phone and did you install all update of WebView?