Changing mp3 file bpm/tempo for use with Mixxx to reduce slowing/bogging/sluggishness

Just had a good idea of minimizing cpu usage while using Mixxx. The best idea I came up with was to resample the mp3 to increase/decrease the tempo (w/o affecting pitch).

sox original.mp3 newfile.changedBPM.mp3 tempo 1.025

This will give it an increase of 2.5% where 1.1 would give 10%. and the opposite is 0.9 would give -10%.

However if you want the pitch to change as well, just replace tempo with speed. Now instead of Mixxx dealing with the BPM change and slowing things down, just get the files as close as possible to each other and play DJ w/o the slow down.

I use a netbook so it's not that powerful and whenever I hit the "key" option to keep the same pitch and do a sync to beatmatch...all hell breaks loose and I get random sluggishness. So by changing the files beforehand, this should reduce the calculations needed by Mixxx. Haven't tried it yet as I'm at work but crossing fingers!

[solved] Behringer UCA202 low volume issue on computer speakers

So I bought one after hearing some reviews and finding out that it's compatible with Mixxx. However I was a bit disappointed when I connected the RCA output to my RCA input on my computer speakers. The volume was very low and I had to crank it up and the gain to hear anything. Then I read online how you need a preamp to get any usable volume.
But recently I bought an RCA to 1/8" phone jack Y-cable to connect [edit] from the Behringer's RCA outputs to my PC speakers' 1/8" inputs [end edit] and lo and behold the volume was fine! The line level volume was perfect and more importantly usable! No need for any extra equipment. Hope this helps you out!

Happy DJ'ing!