On FC1.1, when friendly AWACS begin to speek information, the drawings of frame stops while a few hundred milli-sec - 1 sec.
(I know this occurs on multiplay. I don't know this occurs on on single play.)
I found the way to solve this problem.
1. Get ogg vorbis package version 0.9.9.5 from here
http://tobias.everwicked.com/oggds.htm
2. Execute OggDS0995.exe and install ogg package
3. Open C:\WINDOWS\system32\ using explorer and find these files
ogg.dll
OggDS.dll
vorbis.dll
vorbisenc.dll
4. Copy these files to LockOn installed folder (overwrite)
This kind of stutter will be solved by this way.
Try it!, if you are in trouble.