I wonder if this is the inverse of "Moore's Law" that the peception of any given RPi's speed halves every year and a half
Given the subjective nature of percieved speed maybe there is some relatavistic component to the inverse that may change the time element of the inverse of "Moore's Law".
The advantage you have with a RPi is you can build your RPi to do one dedicated task and swap out the SD card when you change task, this would stop an accumulation of background demons. Or a more drastic option a re-image
Of course we now have multiple generations and models of RPi as well as flavours and Build's of Linux.
All of these variations can lead to different perceptions of speed.
Noob is not derogatory the noob is just the lower end of the noob--geek spectrum being a noob is just your first step towards being an uber-geek
If you find a solution please post it in the wiki the forum dies too quick