TCP Fast Open (TFO) uses a cookie to resume connections. Some servers reuse cookies. Others re-negotiate every time.
A British IPTV reseller whose server reuses TFO cookies reconnects faster. A British IPTV provider that re-negotiates TFO cookies adds round trips to every reconnect.
Here's the optimisation: cookie reuse is the benefit of TFO. The IPTV reseller UK who respects cookie lifetimes reaps the speed benefit. One that ignores cookies loses the advantage.
In most cases, what actually works is reconnecting to the same server after a few minutes. If the second connection is faster than the first, TFO cookie reuse likely works. If it's the same speed, no reuse.
Scenario: you reconnect to the same stream. With cookie reuse, the second connection saves a round trip. Without reuse, every connection is full handshake.
I've watched an IPTV reseller UK ensure TFO cookie reuse. Repeat connections became faster. Customers on unstable networks noticed.
Honestly, test reconnect speed. A British IPTV reseller UK with faster reconnects likely uses TFO cookie reuse. One with consistently slow reconnects doesn't.
A British IPTV reseller who reuses TFO cookies respects that the benefit of TFO is cookie reuse. Without reuse, TFO is pointless.