Canon officially announced a new firmware update 2.0.2 for their mirrorless EOS M camera which significantly improves the sluggish AF. Here is a list of the fixes and improvements:
1. Improves focusing speed in One-Shot AF mode.
2. Now supports EF-M 11-22mm f/4-5.6 IS STM.
3. Corrects errors in the Simplified Chinese, Hungarian, Traditional Chinese and Korean language menus.