For me CM11 is faster than 10.1.3 and 10.2, additionally it's more united. Smaller amount of lags, and despite the fact it's nightly, ROM is pretty stable
Of course wipe is mandatory, so back up everything.
Buckle up and enjoy CM11 Best regards.
EDIT: Flash any KK kernel if status 7 error.
Thanks to God for bricks! Without them XDA wouldn't be so stable building
Samsung Galaxy S GT-I9000 - Old chip (M).
CyanogenMod 11.0 (nightlies).
Neo-Kernel / NeatKernel
Stock Kernel (since fixes in 20140917-NIGHTLY).
100 - 1200 MHz.