"Lag spikes every 5 seconds." Fix: That is JavaScript garbage collection. In the IMC client, turn on "Memory Saver Mode" in the Video Settings. This tells the game to collect garbage during loading screens, not during combat.
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If you meant something else (e.g., “Better” as in the BetterCraft client, or comparing EaglercraftX to other web Minecraft versions), let me know and I’ll refine the answer. imc eaglercraftx better
You might think, "Why not just buy the real Minecraft?" Here is the value proposition: "Lag spikes every 5 seconds
Is IMC EaglercraftX better than vanilla Eaglercraft? Absolutely. By a landslide. “Better” as in the BetterCraft client