It seems that there is a problem that Chrome becomes heavy in the environment where Avira AntiVir/Avira Antivirus is installed.
A workaround is to run Chrome as administrator.
1. Quit Chrome completely.
It may remain in the background, so if you are concerned, please restart your computer.
2. Right-click the Chrome shortcut and select "Properties" → "Advanced" → "Run as administrator".
3. Then start Chrome as usual.
