Thanks for letting us know, I've noted your findings to the list of suggestions for future releases.
We are running VMAN 126.96.36.1994 on a vSphere 5.5 cluster. The appliance has 4 vCPU and 8GB of memory, but when it's collecting data (performance or configuration) it really slows down to the point where you can't really use the app/site. We are connected to 4 vCenters, but we have other tooling that is doing the same and it really never chokes.
I'm curious if we are in the same boat, but instead of LIS it would be the VMWare tools which provide the same functionality in the VMware world.
I may give this a try on a test server we have up, see if the results are much better. Otherwise, I may have to cut a ticket, this really makes the interface unusable considering our polling for performance is fairly often and because of customer requirements, we must keep that level up. Can't afford to drop them to 60 minutes.
If anyone has any advice, I'm open to suggestions.