RenanPisi Your dxdiag shows that a component of Avast is crashing repeatedly. A malfunctioning antivirus can cause any affected software to lag, so please uninstall Avast and test the game without it. As long as you don't do anything else at the same time, your computer should be safe.
If you want to use Avast going forward, that's fine—a reinstall may fix the issue. But it's important to test without it present at all to see whether it is in fact at least part of the issue.
Please also play with your computer plugged in, not running only on battery.