Finally, XDA Developer, Tytung updated his NexusHD2 build to Android 2.3.5 (GRJ90). As usual, it is based on Google’s AOSP stock Gingerbread for Nexus One. And using his latest GPS Libraries v1.9. Besides, he also added new Android Market 3.0.27, Gmail 2.3.5 and Google Maps 5.8.0.
NexusHD2-Gingerbread on HTC HD2
Stock 3D Launcher
Hmm… The I/O and 2D speed do not increase in Android 2.3.5. Might be CyanogenMod 7 team had done something to it.
Installation guide ~ How to Install CWM NAND Android on HTC HD2? (Video)
Download NexusHD2-Gingerbread v2.9 [Kernel: Tytung r10] NAND ROM here.