Result

Querying 1,000,000 times with 1,000,000 elements:

Container	Mean(ms)	Min(ms)	Max(ms)	Range	AllocatedBytes	Operations	Ratio of Mean(ms)
Dictionary	34.72	30.65	36.33	16%	170	656	1.00x
ConcurrentDictionary	129.94	128.51	131.43	2%	542	60	3.74x
ConditionalWeakTable	168.45	150.94	184.17	20%	542	236	4.85x