I started in forex a long long so know exactly what you talking about. No worries on futures
Market.
IB does not publish every tick. They aggregate and publish quotes every 250 milliseconds or so.
thank you for your words, it's reassuring me, if i can impose on your time , i've found this on the forum :
https://www.elitetrader.com/et/threads/interactive-brokers-insisting-on-spiked-fx-price.322308/
Can you give me your view on this problem which looks close to mine ? ty
That's what is really interesting with them, they're offering futures AND forex 
