DNASkittle is a web based genome browser that provides an interactive visualization of the raw sequence. Every nucleotide of 10Kbp can fit on one screen at a time. It makes heavy use of signal processing techniques to extract tandem repeats, and other genome elements.
PearsonCorrelation is by far the slowest operation. Place this as a fast C function library call and it will speed up Heatmap and RepeatMap immensely.