When using any optimization tool, prioritize your system's stability and security. Always research thoroughly and consider seeking advice from tech support forums or professionals if you're unsure about a particular tool.
Look for a personal site or GitHub repository belonging to the original mod creator (e.g., user names like "xlagdev" or "xlabaseball"). This is rare but the safest.
While XLAG 3.0 is generally considered a "simple program" rather than a virus, its use falls into a legal and ethical grey area. xLag 3.0 Tutorial + Download