Eaglercraft uses and custom OpenGL emulators to run a Java virtual machine within the browser. This enables a near-native Minecraft experience without requiring a standard launcher or standalone installation.
Even the new version is not fully optimized for integrated graphics. Reduce your "Render Distance" to "Short" in the settings menu and close other tabs. If it still lags, look for a "Performance Mode" toggle in the GitHub README. eaglecraft unblocked github new