Convert your ACT v3 triggers from this:

.*?You feel a powerful curse.*

To this:

You feel a powerful curse

Why? Read link. This is for ACT V3+ only. This will simply help you convert all your inefficient triggers to use less CPU. More complex triggers require proper RegEx to be as efficient as possible.
You can see some example triggers on ACT's website here.

The tool below will ONLY alter triggers that begin with .*? and/or end with .*

1. Locate the following folder: %APPDATA%\Advanced Combat Tracker\Config
2. Locate the ACT config file: Advanced Combat Tracker.config.xml
3. Create a copy/backup of the file.
4. Open the file with Notepad, and Copy & Paste the entire file's contents below (or just the <Triggers> section)
5. Replace the contents of your ACT config file with the new code generated below and Save.