The lag on the lock screen is a known issue. There is no known fix for 10.1.3. Latest nightlies for CM 10.2 have solved that issue.
I agree with you that CM 10.1.3 is terrific with the exception of the lock screen issue. I'd recommend waiting until the 10.2 ROM is stable before switching.
Sent from my One S using xda app-developers app
Device: HTC One S (S-OFF)
ROM: CM v10.1.3
Recovery: TWRP v184.108.40.206
Kernel: CM Stock
Governor: CM Stock