Optifine is a legitimate, safe Minecraft mod, but it is only safe when downloaded from the official developer site.
Are you seeing any on your computer now (pop-ups, slow performance)? Optifine is a legitimate, safe Minecraft mod, but
Stop the malware from communicating with a server. Run a Full Scan: Use Microsoft Defender or Malwarebytes . Optifine is a legitimate
If the download is an .exe instead of a .jar file, it is almost certainly a virus. safe Minecraft mod
Click the (Mirror) link to skip the ad-heavy landing page.
Right-click the downloaded file and select Open with... > Java(TM) Platform SE binary . 🛑 If You Already Clicked the Link If you downloaded and ran a file from an unofficial source: