DisplayFusion v4.2 is chewing up CPU cycles on my computer. I'm running Win7 Ultimate 64-bit. I have an i5-2500k and 32GB of RAM. I'm not sure if or what other software could potentially be causing a problem with DisplayFusion.

Every now and again mouse and keyboard input will slow down or freeze (due to high CPU usage by DisplayFusion as reported by Task Manager) I think high network traffic is correlated but I can't be sure. It might be related to task bar item progress overlays but again, I'm not sure. Shutting down DisplayFusion solves my problem.

v4.1 was fine. Is there a link to v4.1 somewhere so I could roll back?

I've attached the troubleshooting log.

It doesn't seem to be correlated to the wallpaper changing, no.

I already had TitleBar Buttons disabled so I didn't check that.

When I disable the Multi-Monitor Taskbar, the problem seems to go away.

Sure thing. Give me a few days.

I've attached the log. In this particular case, it occurred around 14:18 on 2012.11.04. Everything effectively freezes so it's hard to get an accurate CPU usage value from Task Manager since it can't update the window. However, after the issue subsides, the highest value displayed for DisplayFusion.exe was 17%. I suspect it's at or near 100% while the issue occurs, though.

I am able to consistently replicate the problem when loading Ubisoft's uPlay client from Valve's Steam client. So, that's what I did in this particular case. The problem is not limited to this case, though. Also, when I disable the Multi-Monitor Task Bar, the problem goes away.

It does. Freezing and slowdown are no longer an issue with global application hooks disabled.

I can't pin point the problem. It seems to work fine when I disable everything I can (both applications and services) At a certain point after launching more things, it starts to slow down. Even after shutting those things down, the problem persists for a bit. No one application causes the issue. It's not a RAM issue, either.

After further investigation, it doesn't seem to be related to the application hooks setting at all. With the setting disabled in the new v4.3, I still get slow down.

As before, I'm testing by launching Steam, then uPlay from Steam, and swirling my mouse around until the uPlay front end displays.

Shutting down DisplayFusion resolves the problem.

I've noticed it occurring more generally with DisplayFusion, as well. I just tried to click on the Troubleshooting menu in the settings window and it slowed to a crawl.

Sorry for the long delay. I was getting frustrated with the situation and decided I should probably do my due diligence to ensure it wasn't an issue with DisplayFusion. Turns out, it wasn't.

Somehow, launching certain applications (such as uPlay) would cause a printer-specific application (HPNetworkCommunicator.exe) to freak out which in turn caused my AV software (Kaspersky Anti-Virus) to start scanning it...which when combined with DisplayFusion caused everything to slow to a crawl. Disabling any one of HPNetworkCommunicator, KAV, or DisplayFusion would solve the issue. Ultimately, I ended up placing HPNetworkCommunicator in the trusted group of applications in my AV software; causing KAV to ignore the app entirely. Everything works fine.

Thanks for your patience and your efforts. I appreciate it. I thought I had disabled KAV before reporting the issue but it turns out KAV actually stays resident and active even when shut down from its front-end, for some reason. Still, I should have thoroughly troubleshooted before bothering you.