Which is better for testing Performance simulator or actual Device

Question

My Windows store app loads the background image slowly when I switch from Landscape to portrait mode on the simulator. I believe its happening as the image is little heavy and takes time to load. Is it a good practice to rely on simulator for such issues?

Answer 1

Simulator is not good for testing performance. You can do initial testing and development on the simulator, but for final testing and especially for performance - you need an actual device or possibly multiple different devices. Trivial apps will work fast on any device, but if you do anything complicated - large images, large collections or otherwise large resources, complicated animations - especially ones that animate dependent properties and DirectX - these need to be tested on a range of devices to get good quality.