Have you ever wondered why iPhone OS 3.0 suddenly killed the iPhone 3G? And Apple’s real reason to disable multitasking and wallpapers on iOS 4 iPhone 3G edition? Well, the ancient device has had trouble indexing through integrated Spotlight ever since 3.0.

Those on iOS 4.0 have noticed how slow the mobile operating system runs on the ancient iPhone 3G, and here’s a way to make it just a pinch snappier. You know of Spotlight, right? That search system that Apple introduced in 3.0, that allows you to search for everything on your iPhone? Due to the minimum specs of the 3G, indexing is a bit of a bugger for the phone. You see, Spotlight indexes everything on the phone…as you use it. It’s not a noticeable thing on the 3GS or 4 (obviously), but 3G users suffer.

You probably don’t use Spotlight at all, though. So let’s disable it altogether.

Go to Settings.app, and then to General, and finally to Spotlight Search. Uncheck everything you don’t use (or uncheck it all, like I did). Reboot. There you go!

I tried this out with little belief, but I noticed that both the iPhone and apps launched quite a bit faster than they used to. It’s not 3GS iOS 4, but it’s better than nothing, right?

We have a video of iOS 4 vs 3.1.3 on the 3G after the break!

[via MMi]