優化LINQ OrderByDescending查詢

Question

我需要在通用集合上運行LINQ。
當前查詢的運行速度非常慢...

var patternsWithMaxLenArray = totalPatterns
    .Where
    (
        pattern => pattern.Contains(maxLen) &&
                   pattern.All(lenInPattern => curQuantities.Keys.Contains(lenInPattern)) &&
                   pattern.GroupBy(len => len).All(g => g.Count() <= curQuantities[g.Key])
    )
    .Select(pattern => new { pattern = pattern, sum = pattern.Sum() })
    .ToArray();

var patternsWithMaxLen = patternsWithMaxLenArray
    .OrderByDescending(patternsum => patternsum.sum)
    .Select(patternsum => patternsum.pattern);

var iq = patternsWithMaxLen.First();

Answer 1

測量測量測量。 將所有內容剝離到最簡單的查詢並進行度量。 然后一次添加一些位，直到找到“洞”。