SAP Client GUI slow on Windows Terminlserver 2008, Strategy / Idea question

Hello, 

1. Probelm:  Endcustomer claim GUI Lag particular in SAP Client GUI during normal operations, switchen menues/windows
2. Endcustomer uses simple Windows 7 PCs as  WTS Client.
3. No Problem on the local windows 7 maschine with SAP Client Gui  behavior

currently Idea´s  of troubleshouting / making SAP Client GUI faster:

1. check this out: http://support.citrix.com/article/CTX127399

2. (but I am not sure whether SAP Client GUI is using JAVA  (increase Java Heap Size http://www.wikihow.com/Increase-Java-Memory-in-Windows-7)

3.looking into PerfMon  Tool and try to generate cinclusion  ( well - I don´t have experience with that)

4. I didn´t know if REMOTE FX would improve the above mentioned problem, I understand not.  (mostly for OPEN GL/Direct X requirements)

5. I didn understand the Tuning Tools of VMware yet.  

What do you suggest?

My Idea:   Waiting for Server 2016 Release and make a new Try. 

our system:  2 x HPE DL380 G8 with EMC Storage and 4 WTS 2008 R2 Server with Broker Service on it.  (each 24 GB RAM and much CPU) (extra SQL Database Server) approx. 50-100 User