I use it on a Mid 2010 Macbook Pro 2.4 C2D, with spinning HDD 256 GB and default 4GB RAM. The system also has Snow Leopard.
The boot time is longer than Snow Leopard but i find it pretty quick to use overall. No major UI lag anywhere. But this particular laptop is only used for webbrowsing,so my experience may not be similar to a normal user or a power user.