Prophet for Navigation System (only)

[cyberroller]

Hi,

I want to use my Prophet as Navigation system only (no GSM, no programs, no multimedia). The Propher connects with to an external GPS-Receiver via Bluetooth. Navigation Software is I-Go. I have used it many times with good results.

In order to make the software work faster (smoother) and to use as little as possible battery power i want to have a fast, clean, and stable rom installed.
Which of all those roms out there is appropriate? I guess the memory pool is very important here? Are there any ready-made Roms suitable for this task or should i cook a new one? Which rom should be the base one? I guess i should look for a WM5-rom? Or is WM6 faster?

Thanks in advance!

XDA Neo G4. Cid locked.

[cyberroller]

OK, I see I asked to many questions at the same time :)

So I'll try to summarize:

Is it worth to change the Qtek_NVID WM5 ROM from "Step 1" in order to gain more free memory/speed...
...or everything, not necessary for the operation system to function, is already"stripped away"?

Thanks!