So now you're qualifying your statement with rough air and reducing speed.
Why not say that in the first place instead of ommiting it to try and prove that French ATC aren't up to standard.
So, ATC would have had a fairly good idea of your aircraft performance except you didn't tell them you were having to slow down because of turbulence.
Seems to me that you have just admitted to very poor, basic, airmanship.
And no customer, no matter how much they paid for their ticket, takes priority over the safe and efficient flow of air traffic.