Methods to improve the speed of Linux VPS cloud hosts involve many aspects, including optimizing the operating system, network, service configuration, etc. Here are some common methods:

　　Choose the right instance type: If you use a virtual machine instance provided by a cloud service provider, be sure to choose an instance type that is suitable for your application load. Different instance types have different compute, memory, and network performance.

　　Upgrade hardware specifications: If your budget allows, consider upgrading to a virtual machine instance with higher specifications to obtain more computing resources and performance.

　　Use SSD storage: Try to use a solid-state drive (SSD) instead of a traditional hard disk (HDD), because SSD has faster read and write speeds and can significantly improve disk I/O performance.

　　Operating system optimization:

　　​ Ensure that the operating system and software packages are up to date to obtain performance and security improvements.

　　Disable unnecessary services and processes to free up system resources.

　　Adjust kernel parameters, such as adjusting file handle limits, TCP parameters, etc., to adapt to load requirements.

　　Use acceleration technology:

　　Install and configure a reverse proxy server like Varnish, Nginx or Apache to increase the transmission speed of static resources.

　　Use caching mechanisms, such as Memcached or Redis, to reduce database load.

　　Network Optimization:

　　Configure reasonable firewall rules to ensure the security of network access.

　　​Adjust TCP parameters to improve network performance.

　　Use CDN (Content Delivery Network) to speed up the transmission of static resources.

　　Database optimization:

　　Perform performance adjustments and index optimization for specific database systems.

　　Regularly clean up useless data and optimize the database table structure.

　　Monitoring and optimization:

　　Use monitoring tools, such as Prometheus, Grafana, etc., to monitor system resource usage in real time and discover performance problems in a timely manner.

　　Adjust system configuration based on monitoring data to maximize resource utilization.

　　Use snapshots and backups: Create system snapshots and data backups regularly to quickly restore the system state when needed.

　　Load Balancing: If application requirements apply, consider using a load balancer to spread traffic and improve system availability and performance.

　　Before doing any optimization, make sure you understand where your application's bottlenecks are so you can optimize accordingly. Additionally, it is recommended to create a system snapshot or backup before making any changes, just in case anything unexpected happens.