com.apple.hiservices-xpcservice results in frequent hangs and freezes in my mac
Had the problem too.

Tried to disable SIP, then remove execution rights on com.apple.hiservices-xpcservice, reboot after re-enabling SIP.

Result : Safari keeps crashing, each time it opens so it seems to be linked to apple apps.

Giving back execution rights on the service repaired Safari ..

Except killing it when it becomes unresponsive, I don't see any other solution