The NP915S3G has a better Wi-Fi standard than most laptops that were released around the same time as it. This portable PC has an 802.11n WiFi standard, whereas most laptops that were released more than two years ago have an 802.11b WiFi standard. This laptop also has an 802.11g WiFi standard.
An 802.11n WiFi standard is in fact the best Wi-Fi standard across all portable PCs of a similar age and type to the NP915S3G.
The worst Wi-Fi standard amongst comparable types of notebook PC is 802.11a.