Working now, thanks Gerhard!
Still the same error for my site.
Ditto, commenting to save thread.
I was experiencing this slow admin issue running WP 4.4.1, Woocommerce 2.5.1 and found the culprit to be my Stamps.com plug-in. Disabling the Stamps.com plug-in fixed the speed issue. Just today a new update was released from plug-in author for Stamps.com that fixed the plug-in so I can reactivate it without slow down.
