Performance data will be inaccessible between 00:00 UTC and 01:30 UTC daily, while the host data is being updated.
How QuickMag works
QuickMag uses publicly available performance data from all projects on the Gridcoin whitelist to find the top four computers on each project with the specified component. This is used to determine each computers magnitude.
More details are available on the Github page.
Running QuickMag locally will usually be much faster if you are looking up many components. It will also allow you to control when the host data is updated.