In the meantime we are working on a settings which will allow you to completely disable the product while you are not working with it directly (when the product is not opened) which might also serve you in this case as a kind of workaround to make sure that Cleanup won't consume any resources while you're gaming.
Hi, it seems this setting is still missing... 
Else, the beta is running smooth here - no noticeable issues (so far).
Hi,
well this change in particular is still not finished yet, that's why it is unfortunately still missing. We had to prioritize the accessibility for this release so all Avast/AVG products are compliant with accessibility requirements. We continue on
In the meantime we are working on a settings which will allow you to completely disable the product while you are not working with it directly (when the product is not opened) which might also serve you in this case as a kind of workaround to make sure that Cleanup won't consume any resources while you're gaming.
now to make it happen into the next big release.
Thank you.