Just changed a worn Dura Ace CN-7800 chain (5000+ miles, more than half indoors) for a SRAM PC-1050 on my road bike which is on a trainer for the winter. Nothing else changed. Noticed more resistance immediately, verified by higher heart rate (+3 to 4 bpm) at similar watts measured at rear wheel. None of the new chain's links were noticeably stiff nor was there any other sign of defect. Factory lube seemed normal.
Is there a break-in period for new chains? Is the Dura Ace that much better than the Rival class SRAM chain?