Nope, I have seen many users accidentally or otherwise omit that simple fact. Just a friendly advice, I know the feel when you get stuck, beleive me... just to find out later on the cause.
Anyway, have no issues* with 3.4 master or dev versions on several setups in my case. Btw, I have traced on a daily basis entire dev path from 332 to 340 (and contributed to early discovery of some bugs), no difference in speed or anything that affects compatibility with basic plugins.
*in a common sense, software is in constant state of beta.