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There is naturally a lot of resistance in a Bowden cable as nearly all of the surface of the inner cable touches the inside of the outer, so lubrication is important.
The better cables are nylon lined inside, but even so they are still susceptible to corrosion if water gets down inside.
You can buy (or borrow) hydraulic cable oilers, which force lube all the way down the cable.
You could get away with dribbling a light oil down the inner from the top if you are patient.
You would obviously need to release the top of the cable in both cases.
In a worst case you might have a broken strand on the inner cable which is catching on the return stroke. Replacement would be the only answer to that.
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