Using 2 spectrums is pretty cpu intensive I've found, well I both Spectrum Analyzer Peak Band Slider and normal and noticed a huge jump in cpu usage.
It's worth testing for sure.
Check out my mld skin in the pre release section, it has a spectrum in there, all you need to do is clone the group and rename each of the layers to use tb for top to bottom.
You need to use
specbandbt(x) for the main and for the reflection use specbandtb(x)