Gig1 wifi speeds not as expected

I’m struggling with speeds on my Amazon Firestick. A speed test via VM connect on my mobile behind the TV where the Firestick is gives a result of around 600. But a speed test run via the Firestick barely gets 30. I can also plug an Ethernet direct into the Firestick and it’s even slower with that.

Is there anything I can do to achieve the speeds I’m getting on my phone via the Virgin app?

thanks for any help