This post, may be a little late. Vegacream Beta 3 has been released by scanno. It featuring an updated source to the latest AOSP 4.0.4 (IMM76L) and newly compiled kernel. Not yet tried them, but must be some speed improvement. There is an option of using 1 GHz clock or 1.2 GHz the overclocked frequency. And some other improvement to the ROM.
Users and tester already experience this ROM is giving a positive feedback at the tabletroms forum, but also some complain.
The Positive
Some user report an increased speed of the ROM.
Google search is working without crash.
Netflix is working
You can now use adb shell to the tablet.
The Negative
Google voice search not yet working.
Some report of slow GPS lock, but it work.
Some report of unable to use usb disk.
Skype still need fix.
Wifi deep sleep problem is still exist.
The most discussed is about the flash fix of the stock browser. But, there already a workaround you can find at the forum.