Is there any way to measure if they really help. I'we tested Fraps and raised fps in MP to maximum 100, but there is no difference with or without packed textures. I get 60 anyhow. How else can I test?
You should be doing much more complete analysis. For example trying to use some profiling tools to measure the actual GPU load.
Also MP itself should be limiting to v-sync, so the max fps will be the 60Hz in your case.