Nevermind, I checked you Rig stats.
Even at 24x burn speeds (about 4MB/s), an 80MB buffer should take 20 seconds to run out.
If your system is taking that long to launch some other program, then the problem is not your buffer.
I don't know why Nero recommends no higher than that, but I suspect because that memory can be
better used elsewhere, and any system issues that would impact the max buffer setting would probably
be better fixed by other tweaks and upgrades to the system.