Hi, I’m new in server configuration topic but I set up Apache on Ubuntu 14.04 by myself, and I’ve tested my application and I have some question about performance.

My app is downloading xml files (1350 files, 220 mb) from wholesale website by API and it works perfectly but downloading all files took over 30 min for the first time, but after power cycle this same operation took 7 min. In server graphs there is difference between bandwith speed for both tests (#1: 2Mbs, #2: 5Mbs)

My question is: what may be a cause of such difference of downloading after power cycle? What test i need to do?

My server is 2GB Ram 30GB SSD Disk Amsterdam 3 Ubuntu LAMP on 14.04