Check to make sure you do have plenty of clutch fluid. Low level or gear lube are the only things I can think of that would change performance under moving and stopped conditions, other than syncros but that is highly unlikely.
How many miles on car?
I think worst case scenario is CSC going out, but I am thinking not. From what I understand that is an instant failure, not gradual.
I would lean with just changing gear lube. You will notice the difference.
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