Is MacBook Air 1.4ghz enough to run LR4?

I need a MBA for location shoots and will only be using it to upload RAW files from card (14mb NEFs from D700) to Lightroom and to add metadata. No editing or processing, I'll do that when I'm home. I was hoping to get an older one on ebay to save a few quid and wondered if I need the latest 1.7ghz with 8gb RAM or will an older version do, ie the 1.4ghz with 2gb RAM. Will uploading a 16gb card take forever?
Thanks.