4864: Game near unplayable with Win. 10 Update KB4100347 installed

Reported by ☆☆ Sariel at Mon, 19 Nov 2018 16:11:30 UTC
gamemechanic bug
0 confirmations


I have gathered more information and narrowed down the problem to a singular update. The old Issue has been closed.

After installing Windows 10 update KB4100347 the following problem occurs:

The FPS drop from 120 (or 60) to up to 0.

The severity of the FPS drop is proportional to:
[Mouse Velocity] x [Mouse polling rate].

Here a list of affected CPUs and additional infomation regarding update KB4100347:

KB4100347: Intel microcode update


My CPU, as an example: intel i7-4790K @4.00GHz

I can provide video evidence on request.

This behaviour is only observed in DaoC Uthgard.
I can not reproduce it in any other game - some tests: FFXIV, FFXV, League of Legends, Browser Flash Games, Warcraft 3, etc...

Reproduction Steps

1. Install an affected CPU
2. Install the update
3. Open DaoC Uthgard
4. Move your mouse in circles - fast
5. Observe stuttering / FPS drop

Intended Behavior

Intended Behaviour: Mouse movement should not affect in-game FPS.

How to fix: I don't have insights into CPU microcode, or how it responds to DaoC.


Should be self evident. This bug appears and disappears with the mentioned update.


issue is new, and needs confirmation
requires 3 more confirmations
votes (priority): 2
0 players say this report is valid, 0 disagree


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