Hello folks!

I experienced a strange problem in the last couple of days. Software written in VB6 (using GDI+) is running slower on some machines which has much better hardware than my developer PC. The point is, that the target machine is a brand new, very fast notebook (Asus X71VN: Duo P8400, 17'' WXGA+, nVidia GeForce 9650MGT 1GB, 4GB RAM, 2x 320 GB HDD, WLAN 802.11n + BT, WinXP) and my developer PC is an old P4 with 512 RAM. Some dialogs in the above mentioned software needs up to 16 seconds(!!) to display instead of 4 seconds (on my developer PC). I must mention that the software uses custom controls written also in VB6 and using GDI+.
What can be wrong? Is there some hidden setting in the Windows how to speed up some applications? I tried different display resolutions, different compatibility modes, but without better results.
Has somebody a same experience or some hints, tips what to do or where to find more about this problem?

Thank you a lot in advance!
Bela