Benchmark request
I just looked up what the specs are for the i3-6006U you have at the moment: 2Ghz, 4 threads (2 cores) and 3MB cache. That, coupled with the limited 4Gb you have makes for a slow editing machine.
You mention some basic edits, things will become more CPU intensive and thus slower if you start using, for example, Wavelet Levels, Dynamic Range Compression and/or Tone Mapping.
I mentioned RawTherapee leaning on CPU power (+memory), and this is true, but also realize that other programs (Krita, darktable, GIMP etc) do make use of opencl. Don’t neglect your GPU(-card) in you next laptop/desktop just because RT only uses the CPU.
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