There are two versions of Warzone/WarLight: Flash and Unity. Unity is the default. You can change this by going to the top right of the page, clicking your name then by clicking on "Switch to Flash"/"Unity".
Which browser do you use? Firefox is the fastest for loading the Unity version.
Flash is faster than running the Unity version in a browser but you'll need to allow Flash to run on Warzone.com.
If you purchase a membership, you can download a standalone version of Warzone from https://www.warzone.com/wiki/Standalone_Client
for PC, Mac and Linux. Standalone is much faster than running in a browser.
If you want general advice for speeding up your device, let me know.
Loading speed is an issue that is being worked on.
Edited 5/9/2018 07:25:51