Hi,
i) yes, RI-hybrid DFT is currently only available in the serial version.
ii) just RI-J, so do NOT switch on rijk in the last menu of define, just ri.
RI-JK is faster than non-RI calculation only for mid-sized molecules with large basis sets. It has mainly been developed as a pre-step for RI-MP2 and RI-CC2 where large basis sets are the default.
If RI-JK is used for small basis sets like SVP, it can be much slower than the non-RI or the RI-J calculation!!
Regards,
Uwe