for what it's worth, in most cases where I've seen performance issues they've been network related between the proxy and the host. There can be several causes (some can be related to tuning in the vCAC collection code), but in one case I saw that DNS was slow to resolve @ around 11 seconds which works fine for vSphere client but the API for whatever reason it didn't cache the result, we worked with network engineers and put in a record in the hosts file as a temporary workaround until it could be permanently resolved. So I'd make sure connection to and from the vSphere endpoint is optimal.
↧