vsphere 5.5 latest patch, VM performance java.exe latency

hello

i have a strange phenomenon.

java.exe performing very good on physical machine, inside the vSphere VM i have a 10 second delay/latency but just on the first run, second run i have 0,5 seconds completion time.

if i just restart the VM the 10 second delay/latency is gone but comes back after a specific time. on a complete shutdown and start the delay/latency is 10 second delay/latency is back.

basically java.exe generates 5 threads and selects/processes values from a 400 mb file.

what i tried already:

1. disable host power management (set to static high etc.)
2. set VM latency to high
3. removed AV from the VM
4. reserve CPU, RAM resources
5. high share values
6. placed VM exclusively on a host
7. placed VM swap file on a local datastore
8. play around with HT sharing and numa nodes
9. monitor_control.halt_desched = false
10. sched.mem.pshare.enable = false
11. try performance on different sans (NFS,iscsi,local)
12. use large pages in the OS and also with java.exe
13. reinstalled the OS
14. worked through http://www.vmware.com/files/pdf/techpaper/VMW-Tuning-Latency-Sensitive-Workloads.pdf
15. deployed application physically - latency/delay = 0,5 sec (which is the approx target inside a vSphere VM)
16. reinstalled VMware Tools

questions:

can somebody please explain why i have this 10 second delay? or at lease give me a hint where to dig deeper?