Follow these steps on your VPS to check how fast its connection is to EA's Ultimate Team servers.
Connect to your VPS using Remote Desktop, then click the Terminal Emulator icon (a black box with $_ on it) in the bottom taskbar. Alternatively, click Applications in the top left corner and select Terminal Emulator.
Copy and paste the following command into the terminal and press Enter to ping EA's Ultimate Team servers and see the speed:
ping utas.mob.v1.prd.futc-ext.gcp.ea.com