I, too, am seeing high cpu usage by en with version 6.15.4.7934.
Be nice if windows incorporated enhancements which...
- allow users to set, right in task mgr, max cpu possible for an app
- forced an app to report the reason for cpu usage above a certain level... so we would know, for instance, that en is indexing the db, etc.
Be nice if en would throttle-back non-critical, long running, high cpu operations, when sensing keyboard and mouse activity.