propertyInfos количество >500
specialProps количество будет 2.
Какой путь быстрее:
1.
var specialProps = propertyInfos
.Where(v => v.TestName == specialTestName && v.Name == propertyName)
.ToArray();
var relaxed = specialProps.FirstOrDefault(v => v.GroupName == "Relaxed");
var neutral= specialProps.FirstOrDefault(v => v.GroupName == "Neutral");
v.GroupName == "Relaxed" && v.TestName == specialTestName && v.Name == propertyName);
var neutral= propertyInfos.FirstOrDefault(v =>
v.GroupName == "Neutral" && v.TestName == specialTestName && v.Name == propertyName);
Подробнее здесь: https://stackoverflow.com/questions/791 ... -then-firs