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Greases definitely start to solidify at cold temperatures. It is hard to tell without knowing what grease has been used though in your situation.
In our products at work we start using low temperature oils, greases and seals in products to be used below -30 deg c.
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Commuting in temperatures below -10'c these days. The ride feels notably sluggish and I feel like I need to put in significantly more effort to keep the usual pace
Tests on marching soldiers show a substantial increase in energy expenditure when T drops from 20°C to - 10°C. Also there is an increase in drag due to the higher air density at low T. Your grease will slow down, but not critically - common general purpose grease of the type used on bicycles is typically rated to work down to - 20°C
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Could be the tyres getting stiff.
https://www.bicyclerollingresistance.com/specials/crr-temperature-test
"On average, rolling resistance decreases by 17.6% when the tire surface temperature is increased from 20 °C - 68 °F up to 40 °C - 104 °F. "
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Commuting in temperatures below -10'c these days. The ride feels notably sluggish and I feel like I need to put in significantly more effort to keep the usual pace. I am wondering if the grease in my BB and ball bearings does not respond well to the cold. My commuter bike is a bog standard CX jobbie with Shimano 105 for all moving parts.