Complete VPS Performance Optimization Guide 2025 - Make Your Website 3-5x Faster

Before optimizing, first test the VPS's current performance level. These tools are recommended:

System performance testing:

# Bench.sh - 综合性能测试
wget -qO- bench.sh | bash

# Yet-Another-Bench-Script (YABS)
curl -sL yabs.sh | bash

# UnixBench - CPU 性能基准测试
wget --no-check-certificate https://github.com/teddysun/across/raw/master/unixbench.sh
chmod +x unixbench.sh
./unixbench.sh

Network performance testing:

# Speedtest - 测速工具
curl -s https://raw.githubusercontent.com/sivel/speedtest-cli/master/speedtest.py | python3 -

# 回程路由追踪
curl https://raw.githubusercontent.com/zhucaidan/mtr_trace/main/mtr_trace.sh | bash

Disk IO testing:

# dd 测试磁盘写入速度
dd if=/dev/zero of=test bs=1M count=1024 oflag=direct

# fio 详细 IO 测试
apt install fio -y
fio --randrepeat=1 --ioengine=libaio --direct=1 --name=test --filename=test --bs=4k --size=4G --readwrite=randrw --rwmixread=75

After testing, focus on these metrics:

Linux 5.x+ kernels offer significant improvements in network and IO performance:

# Ubuntu/Debian 升级内核
apt update
apt install linux-generic-hwe-22.04
reboot

# 验证内核版本
uname -r

Edit /etc/sysctl.conf and add the following optimization parameters:

# 网络性能优化
net.core.default_qdisc = fq
net.ipv4.tcp_congestion_control = bbr
net.ipv4.tcp_fastopen = 3
net.core.rmem_max = 134217728
net.core.wmem_max = 134217728

# 文件系统优化
fs.file-max = 2097152
vm.swappiness = 10
vm.vfs_cache_pressure = 50

# 应用设置
sysctl -p

BBR congestion control algorithm: BBR, developed by Google, can improve TCP speed by 5-20%, especially in high-latency network environments.

# 查看所有服务
systemctl list-unit-files --type=service

# 禁用不需要的服务（示例）
systemctl disable snapd
systemctl disable bluetooth
systemctl disable cups

Performance comparison (under the same configuration, handling 10,000 concurrent requests):

Recommended configuration: Nginx

# 安装最新版 Nginx
apt install nginx -y

# 编辑 /etc/nginx/nginx.conf
worker_processes auto;
worker_rlimit_nofile 65535;

events {
    worker_connections 65535;
    use epoll;
    multi_accept on;
}

http {
    # 启用 Gzip 压缩
    gzip on;
    gzip_comp_level 6;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml;
    
    # 启用 Brotli 压缩（比 Gzip 快 20%）
    brotli on;
    brotli_comp_level 6;
    
    # 开启文件缓存
    open_file_cache max=200000 inactive=20s;
    open_file_cache_valid 30s;
    open_file_cache_min_uses 2;
    
    # HTTP/2 支持
    http2 on;
}

FastCGI cache (for PHP applications):

# /etc/nginx/conf.d/cache.conf
fastcgi_cache_path /var/cache/nginx levels=1:2 keys_zone=WORDPRESS:100m inactive=60m;
fastcgi_cache_key "$scheme$request_method$host$request_uri";

server {
    location ~ \.php$ {
        fastcgi_cache WORDPRESS;
        fastcgi_cache_valid 200 60m;
        fastcgi_cache_bypass $skip_cache;
        fastcgi_no_cache $skip_cache;
        add_header X-Cache-Status $upstream_cache_status;
    }
}

Static file caching:

location ~* \.(jpg|jpeg|png|gif|ico|css|js|svg|woff|woff2)$ {
    expires 1y;
    add_header Cache-Control "public, immutable";
}

Edit /etc/mysql/my.cnf:

[mysqld]
# 根据 VPS 内存调整（示例：2GB 内存）
innodb_buffer_pool_size = 1G
innodb_log_file_size = 256M
innodb_flush_log_at_trx_commit = 2
innodb_flush_method = O_DIRECT

# 查询缓存
query_cache_type = 1
query_cache_size = 64M

# 连接优化
max_connections = 100
thread_cache_size = 16

Important: innodb_buffer_pool_size is recommended to be set to 50-70% of total memory.

Redis can cache database query results and reduce MySQL load:

# 安装 Redis
apt install redis-server -y

# 优化 Redis 配置 /etc/redis/redis.conf
maxmemory 256mb
maxmemory-policy allkeys-lru
save ""

PHP 8.3 is 30-40% faster than PHP 7.4:

# Ubuntu 安装 PHP 8.3
apt install software-properties-common -y
add-apt-repository ppa:ondrej/php -y
apt update
apt install php8.3-fpm php8.3-mysql php8.3-redis -y

Edit /etc/php/8.3/fpm/php.ini:

[opcache]
opcache.enable=1
opcache.memory_consumption=256
opcache.interned_strings_buffer=16
opcache.max_accelerated_files=10000
opcache.revalidate_freq=60
opcache.fast_shutdown=1

Edit /etc/php/8.3/fpm/pool.d/www.conf:

pm = dynamic
pm.max_children = 50
pm.start_servers = 10
pm.min_spare_servers = 5
pm.max_spare_servers = 20
pm.max_requests = 500

Recommended free CDNs:

• Cloudflare: Global CDN + DDoS protection; the free plan is sufficient
• jsDelivr: Specifically accelerates JS/CSS libraries

# 安装图片优化工具
apt install jpegoptim optipng webp -y

# 批量优化 JPEG
find /var/www/html -name '*.jpg' -exec jpegoptim --max=85 {} \;

# 批量优化 PNG
find /var/www/html -name '*.png' -exec optipng -o5 {} \;

# 转换为 WebP 格式（体积减少 25-35%）
for file in *.jpg; do cwebp -q 85 "$file" -o "${file%.jpg}.webp"; done

# htop - 实时系统监控
apt install htop -y

# iotop - IO 监控
apt install iotop -y

# netdata - 可视化监控面板
bash <(curl -Ss https://my-netdata.io/kickstart.sh)

# 清理系统缓存
apt autoremove -y
apt clean

# 清理日志文件
journalctl --vacuum-time=7d

# 清理 Nginx 缓存
rm -rf /var/cache/nginx/*
nginx -s reload