i dont know but as my experience in using nitdroid it becomes faster after few restarts. if you want to come back to 2.3.4, use 2.3.7 for few days until it becomes smooth and fast then revert back to 2.3.4. you will enjoy stability of 2.3.4 and smoothness of 2.3.7. and also new version of market will also work in 2.3.4 without any force closes.