  A finitely generated group $\G$ equipped with a word-length is said to
satisfy property RD if there are $C, s\geq 0$ such that, for all non-negative
integers $n$, we have $\|a\|\leq C (1+n)^s \|a\|_2$ whenever $a\in\C\G$ is
supported on elements of length at most $n$.
  We show that, for infinite $\G$, the degree $s$ is at least 1/2.
