So which IPTV service are you using, Firestick doesn't do it on it's own. It is simply a modified Android box.
If your WiFI is 170 Mb/s then it will be OK. I have 3BB 1Gb/s, but when it reaches my Fire TV via WiFi, 2.4 or 5 Ghz, it is down to 50 ish, but still OK for streaming depending on the sending company and where they are.
I cannot decide whether Cricket or F1 is the more boring, or Man Utd vs QPR ! 555