Ever since installing the D-Link DPH-50U VOIP device on my PC, my PC has run considerably slower. I did some investigating and this is what I found:
The D-Link VOIP drivers are using excessive Deferred Procedure Calls (DPCs). This amounts to 25% - 30% CPU usage constantly!
To prove this I disabled the D-Link VOIP driver. Immediately my DPCs went down to zero! Re-enabling the driver made the DPCs go back up again.
I have sent D-Link 2 emails about the problem with no reply.
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