After i've looking around for more free ram, i found an solution.
On the one hand, you will have more free ram, the whole phone will be faster and also it looks like it saves more battery. On the other hand, it will disable few transparency and animation things, which are memory hungry. This would be made for phones which just have 512MB ram, but works like a charm on galaxy nexus and give them a little extra boost.
What you need to do is simple:
1. Backup you phone, just to be save if something goes wrong
2. Take your root explorer (one you wanna like use)
3. Go into /system and open the build.prop with text editor
4. Type at the bottom the following line "ro.config.low_ram=true" (of course without "")
5. Save the build.prop and boot into recovery
6. Wipe cache and dalvik cache then you ready to reboot your phone
Hope you'll like it, if not just delete the line, wipe both caches again and reboot your phone.