Hello,
i have exact the same problem.
Since early 2014 with ESXi 5.5 and now with ESXi 5.5 Update 1.
Dell Server with PERC H200 and RAID1.
I testet different LSI SMISes, no luck !!!
Host absolutely slow (VM´s, Host LAN Transfer ....) with installed cim.
same workaround as you
Have you ever used/tested a LSI Controller Driver for the PERC H200 ?
i have no solution yet, sorry :-(