VTune7.0 displays many SSE input assistance events everywhere, some times in MMX code. It shows Performance Impact 148. How in can be if application performance is good? May be something wrong with this vtune version?
You could be having SSE input assists and the performance can still be good (or acceptable for your needs). The SSE input assist event is not precise so the line of source VTune is attributing the input assist to may not necessarily be calling it. You may want to turn on Flush to Zero mode and Denormals are Zero mode and see if the performance of your app changes