MyBoy GBA Emulator slow while linking..

As the title says, whenever I link one phone to another via Bluetooth to have a Pokémon match, it slows down.. So I have to play a slow match! It's speed decreases to like 40-50% of the full speed. Here are the phones I'm using:
Xolo A500s lite (512mb ram)
Moto E2 (1gb ram)
(Edit: It slows down on both of 'em)

I hope you guys can help!
:)

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