At best, there is negligible evidence that major non-MS AV products give a net improvement in security. AV products poison the software ecosystem because their invasive and poorly-implemented code makes it difficult for browser vendors and other developers to improve their own security. When your product crashes on startup due to AV interference, users blame your product, not AV. Worse still, if they make your product incredibly slow and bloated, users just think that’s how your product is. If you’re on Windows 7 or, God forbid, Windows XP, AV software might make you slightly less doomed.”]
Source: https://robert.ocallahan.org/2017/01/disable-your-antivirus-software-except.html