Compare CPU use with and without this patch.
I have it done the dumb/PI*thumb way:
- Ensure your system is idle, no kernel compiling or such in the background
- Start system activity and ensure its always visible
- Set sorting to CPU use and keep and eye there
- Open some file and move the cursor around, fast, semi fast, slower
- Type something, fast, semi fast, slow, super slow
- Watch espacially when you left some "Symbol Range"
The next (little) patch will reduse the CPU use once more. Could perhapse sqashed with this one.