Something I've noticed is that Unreal Gold has zero stutters for me with this renderer (I'm using the 227i patch), while UT99 has some hiccups similar to what you describe; first 30 seconds or so it's very noticeable and if I play for a while I'll get them eventually again for a second or two.
The fact that it doesn't happen in Unreal Gold prompted me to investigate a bit further. I discovered that unlike the original Unreal, UT99 was only using 1 of my cpu cores. I forced UnrealTournament.exe to use all cores with Task Manager by changing the core affinity for the executable. It worked phenomenally for me with that.
I don't have much technical expertise when it comes to these things, but my completely ignorant speculation is that the DX11 renderer is heavy on the CPU usage, and because UT99 only uses one core, it causes performance issues. In fact, I found that Unreal II also had a lot of performance issues for me de facto (that have nothing to do with the DX11 renderer provided here) and changing the game to use all cores mitigated a bit of that for me as well over there.
The only issue is that I have to set the affinity for all cores every time I launch UT99. There's probably some fancy fix that somebody can come up with that automates this process, but unfortunately I lack the knowledge to come up with it.
Hope this proves useful to you.
PutridPete
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