To achieve 900 Mbps on Wi-Fi, there are several factors to consider. Firstly, ensure that both your device and router support the 8011ac Wi-Fi standard, which is capable of delivering higher speeds compared to older standards like 8011n or 8011g. Next, make sure that you have a reliable internet connection with enough bandwidth to support such high speeds. It's also important that you have optimal signal strength between your device and the router; this can be achieved by being in close proximity to the router or using Wi-Fi range extenders if necessary. Additionally, reducing interference from other devices and networks operating on the same frequency band will help maximize speeds. Lastly, ensure that you're using modern networking equipment with advanced features like beamforming or multiple antennas that can enhance signal strength and stability.