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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. "
Sumo
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.