The speed of VPS in the United States is affected by a variety of factors, including the location of the data center where the server is located, network bandwidth, network load, geographical location, network routing and Internet infrastructure. The access speed of the American VPS depends on many variables, so it cannot simply determine its influencing factor.

　　The influencing factor of the American VPS access speed is as follows:

　　1. Geographical distance: If our physical location is far from the United States, it may increase network latency and affect access speed.

　　2. Network bandwidth: The network bandwidth of the American VPS determines the rate of data transmission. High bandwidth can provide faster data transmission speed.

　　3. Data center location: Different cloud service providers may have data centers in different regions of the United States. Choosing data centers closer to our user group can reduce delay.

　　4. Network load: If the server load of the data center is too heavy, it may cause network congestion and affect access speed.

　　5. Network routing: The route of data on the Internet may affect the speed of data transmission. Sometimes, data may require multiple network nodes to reach the destination, which may increase delays.

　　6. Internet infrastructure: Internet infrastructure in each region is different, which may affect access speed and stability.

　　7. Service provider used: Different cloud service providers may have different network structures and performance.

　　8. CDN use: Using content distribution network (CDN) can speed up access speed and reduce data transmission distance by cache content distributed on the world.

　　9. Network optimization: Some cloud service providers provide network optimization and acceleration functions to provide better access speed.

　　Overall, the access speed of American VPS will vary depending on various factors. If we have requirements for access speed, we can choose data centers near our own user group, and use network optimization technology and content distribution networks to improve access speed and performance. In addition, we can also use some network speed measurement tools to test access speed to understand the actual situation.