Three seconds. That's the maximum acceptable channel switching time. Anything longer, and you'll stop surfing. You'll stay on one channel. You'll miss discovery.
A fast British iptv reseller switches channels in 1-2 seconds. Their servers are optimised. Their CDN is local. Their caching is aggressive.
The British iptv service I use averages 1.8 seconds. I measured. 100 channel switches. Average 1.8. Fastest 0.9. Slowest 3.2.
A slow IPTV reseller UK takes 5-10 seconds per channel. You learn not to switch. You watch whatever is already on. That's not freedom. That's captivity.
Test your channel switching speed today. Pick 10 channels. Switch between them. Count seconds. If the average is over 4 seconds, your reseller is too slow.
Speed isn't a luxury. It's a basic usability feature.