Onejay's port of CM 10.1 has no freezings and works great, actually, with no bugs.
Your device should not be laggy, even if you are in the 4.0.4 version of the stock rom. Try uninstalling some rescource-demanding apps.
If you really want to go to that old and largely outdated Gingerbread, try using the right RUU.
Have a nice day !