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From MCPEServerMaker Wiki
Optional Features listof the app. By default this setting is disabled because it might lag your server due to increased workload. If you feel like your server is lagging while using Nether then try disabling it.
When Nether is enabled players can construct and use a Nether portal to travel to the Nether world!
Have a question about the plug-in Nether? Ask it on the forums here!