I found that some cameras (in particular my Pentax K-01 and Fuji X10) have a decent burst speed (around 6fps in JPEG before it starts buffering and slows down) but when operating in single shot mode they take an awfully long time between shots.
It takes more than a full second of wait until I can snap the next picture when shooting in RAW and it's not much faster in JPEG. The buffer size should be big enough to allow me to take at least 3 consecutive pictures (as when using the bracketing function it really takes the 3 RAW pictures in a blaze), but it looks like the camera has to clean the whole buffer before allowing me to take the next one...
My much older (but higher end) Pentax K10D could take shots in rapid succession in single shot mode until the buffer was completely full (after about 10 pictures if I remember well).
Is this feature crippled on purpose to differentiate between more expensive models?