Being a machine much larger than the iPhone / iPod touch, the iPad has larger batteries and require more energy to complete the charge of its batteries. Because of this, Apple just released the iPad charging via USB on your Mac's (where he would be sure that the USB ports would have enough energy to power the unit.)
The result of this decision ended up harming the users PC's, which were left only with the option of charging the outlet, due to the low load present in the USB ports of most conventional computers.
Given the controversial attitude of Apple, Asus has not stood still and created a solution to the problem: Aicharger, an application that recognizes when the IPAD is connected and switches the power from the USB port for it, getting to accelerate the rate of 50% loading.
To install it, you must follow a few steps:
Step 1. Download the program by clicking here;
Step 2. Unzip the downloaded file;
Step 3. Inside the unpacked folder, run "setup.exe";
Step 4. On the next screen, click the "Next";
Step 5. Then click on "Finish" button the next screen;
Step 6. Finally, the installer displays a screen asking if you want to restart your computer. Click "Restart Now";
You are done! After restarting the computer, just plug in your USB port and iPad it will reload normally.