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Windows 7: MSE slows extract of .zip files by 100X or more

23 Nov 2016   #1

Win 7 64 bit Professional SP1
MSE slows extract of .zip files by 100X or more

Sometime in the past week or two I suddenly started having trouble extracting files from .zip archives. The problem exists regardless of the size of the archive and regardless of whether I attempt the extract from a file explorer window or using 7-zip. If I shut off real-time protection in MSE, the problem disappears, so I have to assume it's MSE. I've scanned the machine with Malwarebytes and MSE, twice. Both come up clean. The problem is repeatable turning on and off MSE real-time protection. This problem occurs on even small zip archives - the one that I first noticed the problem on is only 1.5MB. Explorer has no problem opening a new file explorer window for the archive, it's on the actual extraction where the problem occurs. Same for 7zip.

Just now I created a new folder and placed a 29KB zip file into the folder and did a custom scan of that single folder with MSE. The computer locked up for almost ten minutes. The scan came out clean. If I turn off real-time protection and extract the zip archive using File Explorer the extract is instantaneous.

For an extract with File Explorer the machine appears frozen, but eventually wakes up. 7zip displays a progress window and the files are extracted at some absurd rate, 100B/sec. (Yes, 100 bytes per second).

I've been through multiple reboots, scans, etc. The problem persists.

This behavior makes MSE worse than worthless. I can't seem to find others having this problem or a fix.

I uninstalled and reinstalled MSE and the problem seems to have disappeared, though it might be a bit early to be confident it's really fixed. Still, if you encounter the same problem, you might want to uninstall/reinstall.

My System SpecsSystem Spec

 MSE slows extract of .zip files by 100X or more

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