Is the new Fire TV Stick 4K really faster? It depends

Last week, Amazon launched a new Fire TV Stick 4K with a bold claim: It’s nearly 20 to 40 percent faster, the company says , than “a similarly priced 4K streaming stick from another leading brand.” Amazon won’t name the competitor, but in my own tests, the advantage over comparably priced streamers isn’t so clear-cut. What I tested Amazon’s own comparison video is impossible to test because it doesn’t show real-world results. Instead, it’s just…