# Optimizing dinucleotides count in a DNA sequence type \`LongDNA\`

**URL:** <https://discourse.julialang.org/t/optimizing-dinucleotides-count-in-a-dna-sequence-type-longdna/101583>\
**Category:** Performance\
**Tags:** question, performance, strings, biology\
**Created:** [July 13, 2023, 4:51pm UTC](https://discourse.julialang.org/t/optimizing-dinucleotides-count-in-a-dna-sequence-type-longdna/101583 "2023-07-13T16:51:55Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![rocco\_sprmnt21](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/rocco_sprmnt21/32/20127_2.png) [@rocco\_sprmnt21](https://discourse.julialang.org/u/rocco_sprmnt21)\
**Post date:** [July 14, 2023, 9:44am UTC](https://discourse.julialang.org/t/optimizing-dinucleotides-count-in-a-dna-sequence-type-longdna/101583/9 "2023-07-14T09:44:42Z")

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squeezing a little more…

```julia
julia> @btime begin
           #a = @view rseq[begin:end-1]
           b = @view rseq[begin+1:end]
           countmap(zip(rseq, b))
       end
  10.514 ms (11 allocations: 1.41 KiB)

```

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