Add one more bullet point for profiling/optimization

README.md

@@ -150,3 +150,6 @@ like netsend, netreceive, etc.)
   more performant than the current implementation. (Not so important for
   current performance, but this may become more relevant once we switch to
   double-precision for block samples.)
+* Possibility to vectorize DSP algos using SIMD. Also more crude experiments
+  by just hand-unrolling one or two classes when N=64 (i.e., the most common
+  block size) and measuring the performance impact (if any).