If you don't want to manually install individual scripts, many players use pre-built . These are modified versions of Eaglercraft that come with performance "mods" and features already baked in.
For multiplayer issues, ensure:
You should see an immediate effect. For example, a Fullbright script looks like this (simplified):
Disclaimer: Eaglercraft is not affiliated with Mojang or Microsoft. Always respect server rules when using mods, and use hacked clients only for educational and research purposes on servers where permitted.
Most custom Eaglercraft 1.8 builds include built-in OptiFine settings. This allows you to turn off animations, lower render distances, and tweak graphics settings to boost FPS.
Remember to always mod responsibly, respect server rules, and enjoy the enhanced gameplay that these community-created modifications provide. Happy modding!