I did the below blocks in uBlock and so far have not had a hung script.
Strictly "guessing" and one of the loaded scripts was just over NINE HUNDRED MEGABYTES.
Everything is working WITHOUT these scripts, so "fingers crossed".
||analytics.xcal.tv/comcast/v3/player$xhr,domain=
www.xfinity.com
||collector.pabs.comcast.com/stream/prod/*$xhr,domain=
www.xfinity.com
||
www.gstatic.com/eureka/clank/*/cast_sender.js^$document
||
www.gstatic.com/cast/sdk/libs/sender/1.0/cast_framework.js^$document
||
www.gstatic.com/cv/js/sender/v1/cast_sender.js?loadCastFramework=1^$document
||
www.xfinity.com/xsfC6x9Cr/eqy85C3WZ/dynly/2MyI/1XaSNDzb9hQ2fDOE/Z0xzNEUp/amE3IB5/tLWcB^$document
||xtvapi.cloudtv.comcast.net/inhome-restrictions/*$xhr,domain=
www.xfinity.com
||xtvapi.cloudtv.comcast.net/tve/stream/linear/heartbeat/*$xhr,domain=
www.xfinity.com
||assets.adobedtm.com^$document
||cdn.cookielaw.org^$document
||geolocation.onetrust.com^$document
||static.cimcontent.net^$document