For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
This board sometimes run slow. I passed ASD several time and never got errors.
Also tried usb hdd and same problem. Some days works ok and some days slow. Any idea what to check?