Definately not my PC. ( It's a whizzy one. ) and it's not cluttered with stuff as I've just re-formatted it.
I'm with Virgin and have a T'internet speed test thingy on my phone.
My broadband speed is - - ( to quote my 85 year old Father - in - Law ) up and down like a whore's draws.
I am at the In-Laws now, on their Wi-Fi - on my Lappy ( Virgin ) and it seems fine.
My son, Steve who is a Virgin installer says it's normal fo the speed to fluctuate depending on the number of users at any one time.
Jim