Extracting sometimes very slow

Expected behavior

extracting <200mb file should take a few secs

Actual behavior

extracting <200mb takes many seconds

Information

Docker for Mac: version: mac-v1.12.0-beta16.2
OS X: version 10.11.4 (build: 15E65)
logs: /tmp/20160624-132348.tar.gz
failure: No error was detected
[OK] docker-cli
[OK] app
[OK] menubar
[OK] virtualization
[OK] system
[OK] osxfs
[OK] db
[OK] slirp
[OK] moby-console
[OK] logs
[OK] vmnetd
[OK] env
[OK] moby
[OK] driver.amd64-linux

Steps to reproduce the behavior

I don’t have a reproducible case, wondering if other uses noticed this on the 1.12 release.