VideoClient.GetAsync is extremely slow

[MichalPetryka]

While profiling our youtube playback code i've noticed that VideoClient.GetAsync takes about 2.3 seconds to complete (as you can see on this screenshot in the last column).

Playback dely resulting from this is quite noticeable and really impacts user experience.
We can reproduce this behaviour on every try.

[Tyrrrz]

Performance improvements are always welcome.

[Tyrrrz]

Can someone profile this with clear separation between CPU-bound operations and IO-bound operations? I want to know how much of the time is actually taken by tasks we can optimize vs just network requests to YouTube which are likely unavoidable.

[MichalPetryka]

Doing time youtube-dl https://www.youtube.com/watch?v=dQw4w9WgXcQ --get-title --skip-download takes 1.55s, this includes whole python interpreter startup, just time youtube-dl takes it 0.7s to print a no url error, so the request itself seems to take about 0.8.
Meanwhile this code:

private static async Task Main(string[] args)
{
    YoutubeClient client = new();
    Stopwatch sw = Stopwatch.StartNew();
    Video video = await client.Videos.GetAsync(args[0]);
    Console.WriteLine(sw.Elapsed.ToString());
    Console.WriteLine(video.Title);
}

with the same video provided takes 4.7s just to do the GetAsync (time from the stopwatch, so it doesn't include whole runtime startup), so I'd say there must be a lot of room for improvements.

[Tyrrrz]

Try the new version, I removed a lot of code from this flow. It should be faster now.