The other items you mention are prioritized differently, with items such as routing updates, VCP, STP, etc. given higher priority. In fact many prior Control Plane items, such as LACP and BFD now function at the PFE level, with no RE/CPU/Control Plane interaction. You need not worry about slow Ping times equating to these other functions not being handled properly. See here as well - https://kb.juniper.net/InfoCenter/index?page=content&id=KB28157&actp=search