High CPU usage when using keyboard to navigate


New Problem.
When i use keyboard(Down/Up button) scroll the editor continually, The cpu usage is 102%.
The file is a small c program, just about 1000 lines.

the same file, opened with sublime text 3 (3062), same action, cpu usage is 46%, but more smoothly

RMBP 2013, 15inch, OSX 10.9.2

AtomHelper High CPU Usage