Here is a small mod to improve a-GPS performance on CM.
You have only to replace your gps.conf file to a new one that has some extra lines.
- faster satelite fixes
- download this file: gps.zip
- unzip it to your SD card
- with RootExplorer (or similar file manager) go to /system/etc and find gps.conf
- rename it to gps.bak (before mount as R/W)
- copy the extracted gps.conf file from your SD card to /system/etc
- restart and test
to undo just delete gps.conf -> rename gps.bak to gps.conf -> restart
Source: [GPS FIX] GPS Fix for all* roms - xda-developers
If you like it, feel free to donate Tom3q