You can open the Patcher settings menu by typing the command Optimized Font Renderer: If you use other mods like Name-Spoofer , you may need to

Runtime patch via JVM argument (safer than editing the jar directly):

Type /patcher in the chat to open the settings GUI.

The mod significantly reduces the technical overhead of running a decade-old game on modern hardware. Its performance suite is often compared to , but while Optifine focuses on graphical settings, Patcher targets internal code inefficiencies.