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Those fancy fairy lights you've lovingly draped over the Christmas tree might look pretty, but they could be causing slower Wi-Fi speeds, UK telecoms regulator Ofcom has warned.

The watchdog has added the festive lights to the likes of baby monitors and microwave ovens as troublesome electronics that may cause interference to 2.4GHz Wi-Fi signals. It estimates up to six million homes and offices could improve the quality and performance of their Internet connection by removing the offending electronics.

To help Wi-Fi users find out if their connection is suffering from interference, Ofcom has released the "Ofcom Wi-Fi Checker" app for Android and iOS. It performs two tests for data loss and data delay across your network, and tells you how well your Wi-Fi network is performing.

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