Transaction launcher is very slow if used Launch in SAP GUI

Dear all,

We are using an transaction launcher of ERP system to view some data. Life was good when they were using SAP Gui for HTML

but suddenly they want SAP gui and not the ****** ( HTML Gui  , that's what they tell to html gui nothing personal ) so I did some changes

1. made the checkbox true for launch in SAP gui

2. activated a SICF service ltx_sapgui_strt ( in both CRM And ERP)

So it worked like charm and opened a transaction in SAP GUI inside crm webui. but there is the catch when user clicked on back button it takes approx. 20 seconds!!!! so is there any way to make it fast like some notes or some parameters maintaine..???

kindly suggest!