TC9 randomly starts using an abnormal amount of CPU cycles after idling.

I ran a performance counter on TC9 while simply writing some code in the editor, nothing else. Check the attached graph. In addition to high CPU usage while moving the mouse around, it seems CPU usage  jumps to 100% everytime I hit a key. I suppose this is from the syntax checker verifying on KeyPress events. That should be done in a separate thread and on a timer. There is no point in verifying if the syntax is good before I finished typing an expression. Once every 5 seconds would be plenty for me.