I myself also seem to notice that with each new month that delivery done by parcel companies outside your country gets longer delays.
Usually from UK to my EU country it took just 4 business days 2 years ago then last year all UK deliveries in my country are no longer done by our national post but by a private parcel company that took 5 business days.
And now a product I ordered from another UK seller in 6 trading days hasn't even reached my country.
Sometimes I feel like parcels are traveling now by road or a ship not by plane anymore which would explain why shipping cost is so low.
And sad part is when you're selecting a shipping option they clearly write delivery in 3-5 business days NOT maybe will be delivered in 2 weeks.
I think merchants should also think twice what parcel companies they choose cause next time buyer might switch a merchant that tolerates parcel companies delaying delivery and upsetting their buyers.
Ahh the time I got a parcel in my country and in custom's office in 4 days from US but I did pay extra for this and now I see this will be the standard for me in future since what I save in getting cheaper price on a product I rather spend on more expensive & faster shipping.
Shame when a parcel within EU takes longer to get to your home than from US.