Why do you think you need more speed, you don't seem to run anything that taxes what you have?
I spend my day doing the same as you, on a Microsoft Go, which has a whopping 2-core 1.6 GHz chip.
I also have an overclocked i7 4790k at 4.6 GHz, with 32 GB RAM, and 3 SSD's. I use it to process thousands of astro photos about 6 times a year using Lightroom. I still want more power for THAT load, but it's overkill for everything else.