有没有人知道更快的方法来做String.Split()？

string[] substrings = input.Split(new[] {','}, 2);

string[] substrings = input.Split(new[] {','}, StringSplitOptions.RemoveEmptyEntries);

string[] substrings = input.Where(c => c == ',')
                            .Select((c, i) => input.Substring(lastIndex, i - lastIndex))
                            .ToArray();

StringBuilder sb = new StringBuilder();
foreach (char c in input)
{
    if (c == ',')
    {
        // Do something with the substring
        sb.Clear();
    }
    else
    {
        sb.Append(c);
    }
}

Parallel.ForEach(input.AsParallel(), () => new StringBuilder(),
    (c, _, sb) =>
    {
        if (c == ',')
        {
            // Do something with the substring
            sb.Clear();
        }
        else
        {
            sb.Append(c);
        }
        return sb;
    },
    sb => { });

var grammar = Parse.Char(',').Many().Token().Select(x => x.ToString());
var result = grammar.Parse(input);